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What should come in place of the question mark (?) in the given series? 20, 10, 40, 20, 80, ? ​
Question

What should come in place of the question mark (?) in the given series?
20, 10, 40, 20, 80, ? ​

A.

40

B.

60

C.

70

D.

50

Correct option is A

Information Given:
Series: 20, 10, 40, 20, 80, ?
Logic: Pattern alternates: ÷2, ×4
Explanation:
20 ÷ 2 = 10
10 × 4 = 40
40 ÷ 2 = 20
20 × 4 = 80
80 ÷ 2 = 40
Final Answer:
40
Final Correct Option:
(a)

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