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Question

A question is given, followed by two statements labelled I and II. Identify which of the statements is/are sufficient/necessary to answer the question.
Question: What is the total of five natural even numbers?
Statements:
I. The second number is two times the first number.
II. All the five even numbers are consecutive even numbers in increasing order.

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
Both the Statements together are necessary to answer the Question

The problem asks us to find the total of five natural even numbers given two statements.

Understanding the Statements:

  1. Statement I: "The second number is two times the first number."
    • This tells us the relationship between the first and second numbers but does not provide specific values or the relationship between all five numbers.
  2. Statement II: "All the five even numbers are consecutive even numbers in increasing order."
    • This indicates that the numbers follow a specific pattern (consecutive even numbers like 2, 4, 6, etc.), but without knowing one of the numbers, we cannot find their total.

Evaluating the Statements Separately:

  • Statement I Alone: Does not provide us with enough information to find the total since we only know about two numbers.
  • Statement II Alone: Although we know the numbers are consecutive, we need at least one specific value to determine the sequence, thus making it insufficient as well.

Using Both Statements Together:

  • By combining both statements, we know:
    • The second number is twice the first, for example, if the first number is 2, then the sequence of numbers following Statement II would be 2, 4, 6, 8, 10.
    • This allows us to determine that the series and their sum would be 2 + 4 + 6 + 8 + 10 = 30.

Hence, both statements together are necessary to find the total of the five numbers.

Conclusion: The correct answer is "Both the Statements together are necessary to answer the Question."

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Important Questions from Data Sufficiency

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    I. The value of 1002 - 992 + 98972 + 962 - 952 + 942  - 932  + ......  + 222   - 212 is 4840.

    II. The value of 

    \(\left(k^2+ \frac{1}{k^2} \right) \left(k- \frac{1}{k} \right) \left(k^4+ \frac{1}{k^4} \right) \) \(\left(k+ \frac{1}{k} \right)\left(k^4- \frac{1}{k^4} \right)\) is \(k^{16}- \frac{1}{k^{16}}\).

  2. Given below is a question followed by two statements I and II. Read both statements carefully to decide which one of them is sufficient to answer the question.

    Six people - A, B, C, D, E and F are sitting in a straight line facing north. Who sits to the immediate left of D?

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    (II) C sits third from the left end of the line. Only one person sits between C and F. E sits third to the right of F.

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    D. Shop P sells tomato at Rs. 23.5 per half kg, grapes at Rs. 85 per kg and milk at Rs. 23 per litre.
  5. You are given a question and two statements. Identify which of the statements is/are sufficient to answer the question.

    Question:

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