Question

The second and fifth terms of a geometric sequence are 750 and -6 respectively. Find the

common ratio and first term of the sequence.

Answer 1

Explanation:

T2= -6

T5=750

ar=-6

ar4=750

both a's cancel each other

we have;

r=-6

r4=750

r4-1(The law of indices) =750

r3=750

r=3√750

r=9.1