The sum of the first 10 terms of a GP is equal to the sum of the first 12 terms in the same GP. The sum of the first 17 terms is 42, what is the fourth term in the GP?

The sum of the first 10 terms of a GP is equal to the sum of the first

1.	The sum of the first 10 terms of a GP is equal to the sum of the first 12 terms in the same GP. The sum of the first 17 terms is 42, what is the fourth term in the GP?
A.	0
B.	–42
C.	42
D.	–21
Answer» C. 42