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5, 11, 21, 43, 85, ?...

5, 11, 21, 43, 85, ?

A

185

B

170

C

171

D

181

लिखित उत्तर

Verified by Experts

The correct Answer is:
C
`5xx22+1=11`
`11xx2-1=21`
`21xx2+1=43`
`43xx2-1=85`
`85xx2-1=85`
`85xx2+1=85`
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