Question

If first term of G.p. is 1 and sum of three terms is 13. Find the common ratio.

Answer 1

Answer:

3,or-4

Step-by-step explanation:

According to the question first three terms are

1 , r, r²

where r is the common ratio

now

1 + r + {r}^{2} = 13

solving

(r+4)(r-3)=0

we get

r=3 or r=-4