If a geometric progression starts at 4 and the common ratio is 2, what is the 4th term?

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Accepted Answer

1. Formula for a geometric term: $a_n = a_1 r^{n-1}$. 
2. Here $a_1=4$, $r=2$, $n=4$. 
3. Compute $a_4 = 4	imes 2^{3} = 4	imes 8 = 32$. 
4. So the 4th term is **32**, which is option (c).

FINAL_ANSWER: c

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