the series is 2n+3 with n being the previous number
2(5)+3=13
2(13)+3=29
2(29)+3=61
2(61)+3=125
2(125)+3=253<----answer
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13 ...23 ...33 ...43 ...53=125■
125Double the difference each time61-29=32so 32x2=64then 64+61=125
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