Question

Which term of the g. P.: 6, –12, 24, – 48, ... Is 384?

Answer 1

an = ar to the power n-1

a = 6,r = -12/6 = -2

384 = 6 x -2 to the power n-1

384 = -12n -12

384 + 12 = -12n

396 = -12n

396 /-12 = n

-33 = n

n = 33....

hope it help you