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2015-06-14T14:35:01+05:30

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Factorial method is multiplying the number from 1 to the specific number which is given
3! + 15 + 9 =30
1*2*3 +15 + 9 = 30
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2015-06-14T15:48:58+05:30
3!= 1x2x3 = 6
3! +15+9= 6+15+9 =30
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