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20 hardest and 20 best questions of 2015

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20 hardest and 20 best questions of 2015 [#permalink]

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27 Jan 2016, 09:40

2

34

20 hardest and 20 best questions of 2015

20 hardest questions posted in 2015 in descending order

If a circle passes through points (9,2*sqrt(3))

If x, y and z are positive integers such that x^4*y^3 = z^2

Abe, Beth, Carl and Duncan are four siblings, among which Abe and Carl

Daniel is playing a dice game in which a dice is rolled 5 times

P and Q are prime numbers less than 70. What is the units digit of P*Q

How many different pairs of integers (a, b) exist such that 2 <= a <=

Allen starts from X, goes to Y. At the same time Bob starts from Y and

If a, b and n are positive integers such that n = 3a ? b3

In the xy-coordinate plane, line L passes through the points (b, a) an

If a and b are positive integers larger than 1, is a^b > b^a?

The numbers D, N, and P are positive integers, such that D < N, and N

At 8am on Thursday, two workers, A and B, each start working independe

In the correctly-worked multiplication problem above, each symbol repr

Is (2a - b)(b - 3c) > 0?

Let a ?2-placer? be a terminating decimal, between 0 and 1, for which

Random Pack 1, Question 3 Three circles with radii...

In the trapezoid above, with sides a, b, c, and 1, what is the value o

When 120 is divided by single-digit integer m the remainder is

x@y = 2x^(1/2) + y^2. How many unique sums of x and y result, if x@y

Four friends go to Macy?s for shopping and buy a top each. Three of th

20 questions posted in 2015 with most kudos bookmarks

Two positive integers a and b are divisible by 5, which is their

If x, y and z are positive integers such that x^4*y^3 = z^2

Five identical pieces of wire are soldered together end-to-end to form

If a, b and n are positive integers such that n = 3a ? b3

Is the product of two integers A and B odd?

If positive integer N = A ? B, where A is a positive integer and B is

P and Q are prime numbers less than 70. What is the units digit of P*Q

The Prime Sum of an integer X greater than 1 is the sum of all prime

When positive integer x is divided by positive integer y, the result i

A line passes through point p(1,1) and q(100,1000). How many other poi

If a, b and n are positive integers such that n = 3a ? b3

The last digit of 12^12 + 13^13 ? 14^14x15^15 =

If 6 coins are tossed, how many different coin sequences will have exa

Set S is composed of following real numbers {1/96 , 2/96 , .. ,

If x and y are positive numbers such that x + y = 1, which of the

How many different prime factors does positive integer n have?

IF N=5^5*..., then how many zeroes exist between decimal and first non

x^n = x^(n+2) for any integer n. Is it true that x > 0?

For all positive integers n and m, the function A(n) equals the follow

Two perpendicular chords intersect in a circle. The segments of one ch

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Re: 20 hardest and 20 best questions of 2015 [#permalink]

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27 Mar 2017, 11:28

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Re: 20 hardest and 20 best questions of 2015 [#permalink] 27 Mar 2017, 11:28

First unread post

20 hardest and 20 best questions of 2015

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Moderators: chetan2u, VeritasPrepKarishma, niks18, mikemcgarry, Bunuel

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