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You are here: Home / Archives for GMAT Tough Math Questions

GMAT Tough Math Questions

GMAT PS : Inequalities & Number Properties

December 31, 2015 By K S Baskar Leave a Comment

GMAT Number Properties and inequalities practice

An interesting number properties question that tests your understanding of odd numbers, even numbers and inequalities. Question If x is a positive integer such that (x-1)(x-3)(x-5)....(x-93) < 0, how many values can x take? A. 47 B. 23 C. 46 D. 21 E. 22 Correct Answer Choice B. x can take 23 values. Explanation Video … [Read more...] about GMAT PS : Inequalities & Number Properties

Number properties – Factorial

November 8, 2010 By K S Baskar Leave a Comment

How many trailing zeroes does 60! have?(A) 12(B) 9(C) 15(D) 14(E) 13 … [Read more...] about Number properties – Factorial

Permutation of Digits & Divisibility

November 8, 2010 By K S Baskar Leave a Comment

Rearrangement of digits of a number

This is an interesting counting methods question that combines a very basic rule of test of divisibility of number by 3. Question How many six digit positive integers comprising only the digits 1 and 2 can be formed such that the number is divisible by 3? 3 20 22 38 360 Correct Answer Choice C. 22 such numbers can be formed. Video Explanation Explanatory … [Read more...] about Permutation of Digits & Divisibility

Descriptive statistics – Standard Deviation

October 27, 2010 By K S Baskar 1 Comment

If m is the arithmetic mean (average) of 4 integers a, b, c, and d and s is the standard deviation of the 4 integers and s = , then is s > 0?(1) m > a(2) a + b + c + d = 0Solution:s will be zero only in two instances: (i) when all the elements in the set are the same, or (ii) the set contains only one element, which in this case is not possible. So, we need to check whether a, … [Read more...] about Descriptive statistics – Standard Deviation

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