Question

For GP if a = 1, r = 2 then S a) 2-1 2 2-1 2n b) c) 2¹ -1 d) 2n + 1​

Answer 1

Answer:

If a is 1 and r is 2 for a GP then S=$2^{n} -1$

Step-by-step explanation:

Given

For the GP,

a=1

r=2

If there are n terms in the GP, and r>1,

Then sum of terms S

$=\frac{a(r^{n} -1)}{r-1} \\\\=\frac{1(2^{n} -1)}{2-1} \\\\=2^{n} -1$