1. If 1/(b + c), 1/(c + a), 1/(a + b) are in AP then
2. The 35th partial sum of the arithmetic sequence with terms an = n/2 + 1
3. The sum of two numbers is 13/6 An even number of arithmetic means are being inserted between them and their sum exceeds their number by 1. Then the number of means inserted is
4. The first term of a GP is 1. The sum of the third term and fifth term is 90. The common ratio of GP is
5. The sum of AP 2, 5, 8, .....up to 50 terms is
6. If 2/3, k, 5/8 are in AP then the value of k is
7. The sum of n terms of the series (1/1.2) + (1/2.3) + (1/3.4) + ...... is
8. If the third term of an A.P. is 7 and its 7 th term is 2 more than three times of its third term, then the sum of its first 20 terms is
9. If the sum of the first 2n terms of the A.P. 2, 5, 8, ....., is equal to the sum of the first n terms of the A.P. 57, 59, 61, ....., then n equals
10. If a is the A.M. of b and c and G1 and G2 are two GM between them then the sum of their cubes is