Posted by Mason on Saturday, April 21, 2012 at 4:03pm.
So in each case you would have 5 terms
AS:
a = 4, t(5) = a+4d = 324
4 + 4d = 324
4d = 320,
d = 80
the three missing terms are 84 , 164, 244
GS:
a = 4, t(5) = ar^4 = 324
r^4 = 81
r = ± 3
if r = 3, the three missing terms would be
12, 36, 108
if r = -3 , the three missing terms would be
-12 , +36, -108