A number n is said to be 'perfect' if the sum of all its divisors excluding n 'itself' is equal to n. An example of perfect number is :

If x + 1/x = 2, then the value of x^2 + 1/(x^2) is :

If a = 24, b = 26, c = 28, then the value of a^2 + b^2 + c^2 - ab - bc...

The product a/(b^2) xx b/(a^2) expressed as the sum of two identical t...

If x = 6 and y = 3 then the value of [x + y]^(x//y) is:

If the arithmetic mean of the numbers x1 , x2, x3,……., xn is barx, the...

The arithmetic mean of first 50 odd natural numbers is :

A boy draws n squares with sides 1,2,3,4,5,…. In inches. The average a...

Which one of the following sets of surds is in correct sequence of asc...

Which one of the following statements is not correct :

If (a^2 + b^2)^3 = (a^3 + b^3)^2 and ab != 0 then (a/b + b/a)^6 is equ...

A page contains 60 lines. A chapter contains 125 pages. A book contain...

If x is a natural number which is a perfect square , then the number x...

If 2^p + 1 is a prime number, then p must be power of:

The number of composite numbers between 101 and 120 is :

The number 10^(N) - 1 is divisible by 11 for :

A merchant has 140 litres, 260 litres, 320 litres of three kinds of oi...

If d is the HCF of a and b, then d = lambda a + mu b where :

The expression (1+1/3)(1+1/4)(1+1/5)dot(1+1/n) simplifies to (n+...

If x = 2^(1//3) + 2^(-1//3) then the value of 2x^3 - 6x will be :