Question

If the common ratio of a sequence is - 3 and the first term is 3, then the fourth term is _

A. 27

B. -27

C. -81

D. 81​

Answer 1

Answer:

b

Step-by-step explanation:

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Answer 2

Common ratio = r = -3

First term = a = 3

Formula for pth term of a GP = arⁿ , where n = p - 1

→ If we need 4th term, n = p - 1 = 4 - 1 = 3

→ 4th term = ar³

→ 4th term = (3)(-3)³

→ 4th term = -81

✓ Option (C)