Question

Find a10 given the geometric sequence 3, 12, 48, 192, ...

Answer 1

Explanation:

first term = a = 3

common ratio = 2nd term ÷ first term

= 12 ÷ 3

r = 4

`a_(n) = ar^(n-1)\\\\a_(10)=3*4^(9)\\\\\\ = 3 * 262144\\\\= 786432`