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What should come in place of question mark in the following series ?
Solution
Clearly , 73 - 9 = 64
105 - 73 = 32
121 - 105 = 16
129 - 121 = 8
Each of the consecutive difference is getting reduced by half. Hence , next difference must be 4 .
i.e. x - 129 = 4
x = 133
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