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1 3 5 11 21 ? 85...

1 3 5 11 21 ? 85

A

54

B

63

C

47

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
D
`1xx2+1=3`
`3xx2-1=5`
`5xx2+1=11`
`11xx2-1=21`
`21xx2+1=43`
`43xx2-1=85`
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