Number increasing geometrical progression (s) with first term unity, such that any three consecutive terms on doubling the middle become an A.P. is (A) 0 (B) 1 (C) 2 (D) infinity

If 4/5,\ a ,\ 2 are three consecutive terms of an A.P., then find the value of a .

The second term of an infinte geometric progression is 2 and its sum to infinity is 8. The first term is

If k ,\ 2k-1 and 2k+1 are three consecutive terms of an A.P., the value of k is

Determine k so that k + 2, 4k - 6 and 3k - 2 are three consecutive terms of an A.P

In an increasing geometric progression, the sum of the first and the last term is 99, the product of the second and the last but one term is 288 and the sum of all the terms is 189. Then, the number of terms in the progression is equal to

If (k - 3), (2k + 1) and (4k + 3) are three consecutive terms of an A.P., find the value of k.

Find the value of x for which (x+2),2x(2x+3) are three consecutive terms of A.P.

For what value of p are 2p+1,\ 13 ,\ 5p-3 are three consecutive terms of an A.P.?

If the sum of the first 11 terms of an arithmetical progression equals that of the first 19 terms, then the sum of its first 30 terms, is (A) equal to 0 (B) equal to -1 (C) equal to 1 (D) non unique

The sum of the first three consecutive terms of an A.P. is 9 and the sum of their squares is 35. Find S_(n)