Question

Q3. Here are the first four terms of a sequence: 11, 22, 44, 88...

a) Write down one expression in terms of n for the nth term of the sequence.

Answer 1

Answer: a(n) = 11*2^(n-1)

a1 = 11

a2 = 22 = 11.2

a3 = 44 = 11.2²

a4 = 88 = 11.2³

......

=> this is a geometic with a1 = 11

r = 2

=>
`a(n)=11.2^(n-1)`

Explanation: