The fourth term of an A.P. is 11 and the eight term exceeds twice the fourth term by 5. Find the A.P. and the sum of first 50 terms.

k + 2, 2k + 7 and 4k + 12 are the first three terms of an A.P. The first term of this A.P. is :

1. -2

2. 0

3. 2

4. 3

If 5, 7 and 9 are in A.P. then which of the following is in A.P.?

1. 5 × 7, 7 × 9 and 9 × 5

2. 5 × 7, 7 × 7 and 9 × 7

3. 2 × 5, 2 × 7 and 5 × 9

4. 5 - 7, 7 - 9 and 9 - 5

Find three numbers in A.P. whose sum is 24 and whose product is 440.