Question

The fifth term of a non-linear sequence is 324. The term-to-term rule is " multiply by 3".

Work out the second term of sequence.

Answer 1

a₂ = 12

Explanation:

Given a₅ = 324

The term- to- term rule is ' multiply by 3 '

Then the reverse rule is ' divide by 3 '

a₄ = a₅ ÷ 3 = 324 ÷ 3 = 108

a₃ = a₄ ÷ 3 = 108 ÷ 3 = 36

a₂ = a₃ ÷ 3 = 36 ÷ 3 = 12