Question

Given the sequence 4, 20, 100, 500, ..., which expression shown would give the ninth term?

Answer 1

4*5⁸

Explanation:

4, 20, 100, 500, ...,

Given GP with first term of a= 4, and common ratio of r=5

nth term

• aₙ= a*rⁿ⁻¹

9th term

• a₉= a*r⁸= 4*5⁸