Question

Find the 5th term of the geometric progression whose first term is 128 and common multiple is 1/2.

A 8 Correct Answer Incorrect Answer
B 6 Correct Answer Incorrect Answer
C 12 Correct Answer Incorrect Answer
D 16 Correct Answer Incorrect Answer

Solution

a = 128, r = 1/2 5th term = 128 × [1/2]5 - 1 ⇒ 128 × [1/2]4 ⇒ 128 × 1/16 ⇒ 8 ∴ The 5th term in progress ion is 8.

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