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Question

Consider a set of 11 numbers:

Value-I = Minimum value of the average of the numbers of the set when they are consecutive integers ≥ -5.
Value-II = Minimum value of the product of the numbers of the set when they are consecutive non-negative integers.

Which one of the following is correct?

The correct answer is

Value-I = Value-II

Analyzing Minimum Average and Product of Consecutive Integers

The question asks us to calculate two specific values based on sets of consecutive integers and then compare them. Let's break down the calculation for Value-I and Value-II separately.

Calculating Value-I: Minimum Average of 11 Consecutive Integers ≥ -5

Value-I is defined as the minimum value of the average of a set of 11 consecutive integers, with the condition that each integer in the set must be greater than or equal to -5 ($\geq -5$).

To minimize the average of a set of consecutive integers, we need to select the set that starts with the smallest possible integer allowed by the condition. The smallest integer permitted is -5.

So, the set of 11 consecutive integers must start with -5. The sequence will be:

  • -5
  • -4
  • -3
  • -2
  • -1
  • 0
  • 1
  • 2
  • 3
  • 4
  • 5

These are 11 consecutive integers, and each one is indeed ≥ -5.

Now, let's find the sum of these 11 consecutive integers:

\begin{equation*} \text{Sum} = (-5) + (-4) + (-3) + (-2) + (-1) + 0 + 1 + 2 + 3 + 4 + 5 \end{equation*}

We can group the numbers for easier calculation:

\begin{equation*} \text{Sum} = (-5 + 5) + (-4 + 4) + (-3 + 3) + (-2 + 2) + (-1 + 1) + 0 \end{equation*}

\begin{equation*} \text{Sum} = 0 + 0 + 0 + 0 + 0 + 0 = 0 \end{equation*}

The average of these 11 numbers is the sum divided by the count (11):

\begin{equation*} \text{Average} = \frac{\text{Sum}}{\text{Number of terms}} = \frac{0}{11} = 0 \end{equation*}

Since we started with the smallest possible integer satisfying the condition, this average is the minimum possible average. Therefore,

Value-I = 0

Calculating Value-II: Minimum Product of 11 Consecutive Non-Negative Integers

Value-II is defined as the minimum value of the product of a set of 11 consecutive non-negative integers. Non-negative integers are integers greater than or equal to zero (0, 1, 2, 3, ...).

To minimize the product of a set of numbers, especially integers, including zero in the set is highly effective. If zero is one of the numbers in the set, the product of all numbers in the set will be zero.

We need a set of 11 consecutive non-negative integers. Can we include 0 in this set? Yes, we can start the sequence at 0. The set of 11 consecutive non-negative integers starting from 0 is:

  • 0
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

These are 11 consecutive integers, and all of them are non-negative.

Now, let's find the product of these 11 consecutive non-negative integers:

\begin{equation*} \text{Product} = 0 \times 1 \times 2 \times 3 \times 4 \times 5 \times 6 \times 7 \times 8 \times 9 \times 10 \end{equation*}

Since one of the factors in the product is 0, the entire product is 0.

\begin{equation*} \text{Product} = 0 \end{equation*}

Any set of 11 consecutive non-negative integers that does not include 0 would consist only of positive integers, and their product would be a positive number (which is greater than 0). For example, the set {1, 2, ..., 11} has a product of $11!$, which is a large positive number. Therefore, the minimum product occurs when 0 is included in the set.

Thus, the minimum product of 11 consecutive non-negative integers is 0.

Value-II = 0

Comparing Value-I and Value-II

We found that:

  • Value-I = 0
  • Value-II = 0

Comparing these two values:

\begin{equation*} \text{Value-I} = \text{Value-II} \end{equation*}

Both Value-I and Value-II are equal to 0.

Conclusion

Based on our calculations, the minimum average of 11 consecutive integers greater than or equal to -5 is 0 (Value-I), and the minimum product of 11 consecutive non-negative integers is also 0 (Value-II). Therefore, Value-I equals Value-II.

Calculation Value Details
Value-I 0 Minimum average of 11 consecutive integers ≥ -5 (Set: -5 to 5)
Value-II 0 Minimum product of 11 consecutive non-negative integers (Set: 0 to 10)

Revision Table: Consecutive Integer Properties

Concept Description Example (for 3 integers)
Consecutive Integers Integers that follow each other in order, differing by 1. -1, 0, 1 or 5, 6, 7
Non-Negative Integers Integers ≥ 0 (0, 1, 2, 3, ...). 0, 1, 2 or 10, 11, 12
Minimizing Average For consecutive integers, the average is minimized by choosing the set starting with the smallest possible value under given constraints. Smallest 3 consecutive integers ≥ 0: 0, 1, 2. Average = (0+1+2)/3 = 1.
Minimizing Product For consecutive integers, the product is minimized by including zero if possible. If all are positive, the product is minimized by choosing the smallest positive integers. If some are negative and some positive, the product can be negative, potentially very small (large negative number). For non-negative integers, including 0 results in the minimum product (which is 0). Smallest 3 consecutive non-negative integers: 0, 1, 2. Product = 0 × 1 × 2 = 0.
Smallest 3 consecutive positive integers: 1, 2, 3. Product = 1 × 2 × 3 = 6.

Additional Information: Number Sets and Properties

Understanding different sets of numbers is crucial for solving such problems involving consecutive integers and non-negative integers.

  • Integers: The set of whole numbers and their opposites {... -3, -2, -1, 0, 1, 2, 3 ...}.
  • Non-negative Integers: A subset of integers starting from zero and increasing: {0, 1, 2, 3, ...}. This set includes 0 and all positive integers. It does *not* include negative integers.
  • Consecutive Numbers: Numbers that follow each other in sequence, with a difference of 1 between each number and the next. Examples include 5, 6, 7 or -2, -1, 0, 1.
  • Average: The sum of a set of numbers divided by the count of numbers in the set. For a set of consecutive integers, the average is equal to the median (the middle number) if the count is odd. In our Value-I calculation, the 11 numbers are -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5. The middle number is the 6th term, which is 0. The average is indeed 0.
  • Product: The result of multiplying a set of numbers together. If any number in the set is zero, the entire product is zero. This property is key to minimizing the product when zero is an option.

In summary, calculating Value-I required finding the lowest possible average of consecutive integers ≥ -5, which was achieved by starting the sequence at -5. Calculating Value-II required finding the lowest possible product of consecutive non-negative integers, which was achieved by including 0 in the sequence.

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