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Find the next number in the given number sequence? 9, 19, 21, 43, 45, ...

Correct Answer: 91

Explanation:

The given number series 9, 19, 21, 43, 45, ... follows a pattern that


ALternately (x 2 + 1) and  (x 1 + 2)



9 x 2 + 1 = 19


19 x 1 + 2 = 21


21 x 2 + 1 = 43


43 x 1 + 2 = 45


45 x 2 + 1 = 91


 


Hence, the next number in the given sequence is 91.


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