MBA Exam

The sum of n terms of an arithmetic progression, starting with 11th term is directly proportional to n^2. The sum of two terms of the arithmetic progression is 0. Which of the following cant be either of these two terms?

1) 5th
2) 11th
3) 21th
4) 16th

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MBA Other Question

Help me solve this:
If an unbiased coin is tossed four times, then the probability that the same face doesnot show up in any two consecutive trails is :

1) 1/16
2) 1/8
3) 3/8
4) 0
5) 7/8
If the pth term of an HP is qr and the qth term is pr, then the rth term of the HP is?

1) pqr
2) 1/pq
3) pq
4) 1/pqr
5) 2/pqr