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Question

Which one of the following is the greatest number by which the product of three consecutive even numbers would be exactly divisible ?

The correct answer is
64

Finding the Greatest Divisor for Consecutive Even Numbers Product

Let the three consecutive even numbers be represented algebraically as $N$, $N+2$, and $N+4$. Their product is $P = N \times (N+2) \times (N+4)$. The question asks for the greatest number from the given options that exactly divides such a product $P$. We need to find the largest value among {12, 24, 48, 64} that is a possible divisor for $P$. We will test this by checking specific examples.

Testing Divisibility with Examples

Let's test a few sets of three consecutive even numbers:

  • Set 1: The numbers are 2, 4, 6. The product $P = 2 \times 4 \times 6 = 48$. Checking divisibility by the options:
    • $48 \div 12 = 4$
    • $48 \div 24 = 2$
    • $48 \div 48 = 1$
    • $48 \div 64$ is not an integer.
    In this case, 64 does not divide the product.
  • Set 2: The numbers are 4, 6, 8. The product $P = 4 \times 6 \times 8 = 192$. Checking divisibility by the options:
    • $192 \div 12 = 16$
    • $192 \div 24 = 8$
    • $192 \div 48 = 4$
    • $192 \div 64 = 3$
    In this case, 192 is divisible by 12, 24, 48, and 64.

We are looking for the greatest number among the options {12, 24, 48, 64} that *can* divide the product. From the examples:

  • 12 divides 48 and 192.
  • 24 divides 48 and 192.
  • 48 divides 48 and 192.
  • 64 divides 192 (but not 48).

Since 64 is an option and it successfully divides the product in the second example (192), and it is the largest value among the options that demonstrates this capability for at least one case, it satisfies the condition.

Conclusion

Comparing the options {12, 24, 48, 64}, the greatest number is 64. This number exactly divides the product for the set {4, 6, 8}.

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Important Questions from Integers

  1. A two digit number is five times the sum of its digits. If 9 is added to the number, the digits interchange their positions. The sum of digits of the number is :
  2. If 6 times the larger number is divided by the smaller number, we get 7 as quotient and 7 as remainder.  Also, if nine times the smaller number is divided by the larger number, we get 7 as the quotient and 21 as the remainder. What are the two numbers?

  3. What is the natural number n for which $3^9 + 3^{12} + 3^{15} + 3^n$ is a perfect cube of an integer ?
  4. The least integer when multiplied by 2940 becomes a perfect square is
  5. If the number
    $2^2 \times 5^4 \times 4^6 \times 10^8 \times 6^{10} \times 15^{12}$
                                 $\times 8^{14} \times 20^{16} \times 10^{18} \times 25^{20}$
     

    is divisible by $10^n$, then which one of the following is the maximum value of $n$?

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