1, 3, 7, 13, 21, 31, 43, ?...

1, 3, 7, 13, 21, 31, 43, ?

A

a. 55

B

b. 57

C

c. 59

D

d. 61

लिखित उत्तर

Verified by Experts

The correct Answer is:

C

`1+2=3`
`3+4=7`
`13+8=21`
`21+10=31`
`331+12=43`
`43+14=57`

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