Find the correct alternative
$1, 5, 13, 29, 61, 125, ?$

252

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258

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255

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253

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Solution

The correct option is D $253$
The mean difference between the consecutive numbers are
$1$ $5$ $13$ $29$ $61$ $125$ $?$
$4$ $8$ $16$ $32$ $64$ $128$
$1 + 4 = 5$
$5 + 8 = 13$
So, $125 + 128 = 253$

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