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You are here: Home   XAT Prep Questions  Number Theory   Test of Divisibility Question 8

Test of Divisibility : Number Properties

The question is a Number Systems and number theory question on test of divisibility.

Question

1025 - 7 is divisible by
  1. 2
  2. 3
  3. 9
  4. Both (2) and (3)
Correct Answer - 3. Choice (2)

Explanatory Answer

To find the number of factors of a given number, express the number as a product of powers of prime numbers.

1025 - 7 = (1025 - 1) - 6

The number 1025 - 1 = 99.....9 (25 digits) is divisible by 3.

Therefore, (1025 - 1) - 6 = (24 nines and unit digit is 3) 99.......93.

This number is divisible by 3 (from amongst the given choices).

Correct answer choice (2)

Level of difficulty : Moderate



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