In a proportion the product of 1st and 4th terms is 40 and that of 2nd and 3rd terms is `2. 5 x` . Then the value of `x` is `16` b. `26` c. `75` d. `90`

In a proportion, the 1st, 2nd and 4th terms are 51, 68 and 108 respectively. Find the 3rd term.

The product of 3rd and 8th terms of a G.P. is 243 and its 4th term is 3. Find its 7th term.

If the coefficients of 2nd,3rd and 4th terms in the expansion of (1+x)^(n) are in A.P.then find the value of n.

If the coefficients of 2nd,3rd and 4th terms in the expansion of (1+x)^(n) are in A.P.then find the value of n.

Find the G.P. whose 2nd term is 12 and 6th term is 27 times the 3rd term.

Find four consecutive terms in an A.P. Whose sum is 72 and the ratio of the product of the 1st and the 4th terms to the product of the 2nd and 3rd terms is 9 : 10. (a) Let the four consecutive terms be a - 3d, a - d, a + d, a + 3d. (b) Using the first condition, find the value of a. (c) Using the second condition, find the value of d and hence the numbers.

In a GP, the sum of first two terms is -4 and the 5th term is 4 times the 3rd term. Find the GP.

If the 2nd term of an AP is 13 and 5th term is 25, what is its 7th term ?