Question

Find the 12th term of the geometric sequence 1, -2, 4,..

Answer 1

this means each time we are multiply in by -2
First term = 1
Second term = -2
Third term = 4
Fourth term = -8
Fifth term = 16
Sixth term = -32
Seventh term = 64
Eighth term = -128
Ninth term = 256
Tenth term = - 512
Eleventh term = 1024
Twelfth term = -2048