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Complete the series - 21, 25, 33, 49, 81,?

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A number series is given with one term missing, find it.
21, 25, 33, 49, 81,?

posted Jan 28, 2014 by Muskan

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Too simple puzzle, please avoid trivial puzzle...

2 Answers

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The pattern is 21+ 4, 25+ 8, 33+ 16, 49+ 32,.... i.e. + 2*2, + 2*2*2, + 2*2*2*2, + 2*2*2*2*2,...
.'. Missing number = 81 + 2*2*2*2*2*2 = 81 + 64 = 145.

answer Jan 28, 2014 by Asmita Agrawal
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145

The difference between consecutive numbers in the sequence is an increasing power of 2 , i.e., 2^2, 2^3, 2^4, 2^5, 2^6, etc.

answer Jul 2, 2015 by Ellen Mahar
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