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21, 25, 33, 49 , 81 , (....)?

http://interviewquestionsanswers.org/quiz/Aptitude http://interviewquestionsanswers.org/qu … itude-Test

Question:
21, 25, 33, 49 , 81 , (....)

Option A):
145
Option B):
129
Option C):
97
Option D):
113

Correct Answer is Option A):
145

Explanation:
The pattern is + 4, + 8, + 16, + 32, .i.e. + 22, + 2 ,+ 2, + 2’,..... :.
Missing number 81+26 = 81 + 64 = 145.