Question

the number of terms in the progression.
1. If in a G.P., the first term a=4, common ratio r= and sum of n terms be (7) 63/64
find the value of n and last term
​

Answer 1

Answer:

For r = 1, the sum of n terms of the Geometric Progression is Sn = na. (ii)When the numerical value of r is less than 1 (i.e., - 1 < r < 1), then the formula Sn = a(1−rn)(1−r) is used. (iii) When the numerical value of r is greater than 1 (i.e., r > 1 or, r < -1) then the formula Sn = a(rn−1)(r−1) is used.