# What is the fifteenth term of the sequence 5,-10,20,-40,80?

##### 1 Answer

Feb 26, 2016

#### Explanation:

from the given set of numbers 5,-10,20,-40,80...it appears like Geometric Sequence and with first term

the formula to find the

Use now

A long check helps after all there are only 15 numbers

5, -10, 20, -40, 80, -160, 320, -640, 1280, -2560, 5120, -10240, 20480, -40960, 81920

God bless....I hope the explanation is useful...