Question

For the G.P., if r = `1/3`, a = 9, find t₇.

Answer 1

Given, r = `1/3`, a = 9

t_n= ar^n–1

∴ t₇ = `9 xx (1/3)^(7 - 1)`

= `9xx(1/3)^6`

= `9xx1/729`

∴ t₇ = `1/81`