Correct Answer : A
There are 5 people - A, B, C, D, E, standing in a queue. How many ways are available to form the queue such that D is not ahead of E ?
Fi nd the next term in the series 123, 129, 141, 147, ____________
Let Sn denote the sum of the squares of the first n odd natural numbers. If Sn = 533n, find the value of n.