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Which number should replace the question mark?

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Which number should replace the question mark?

1            5          13
            29
61         125           ?
posted Mar 25, 2017 by Karan Joglekar

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1 Answer

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1+4=5, 5+8=13,13+16=29,29+32=61,61+64=125,
125+128=253

answer Mar 26, 2017 by Deepak Mishra



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