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2015-01-22T21:10:00+05:30

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Sum of first n natural numbers = n(n+1)/2
sum of first 45 natural numbers = 45(45+1)/2
                                              = 45*46/2 
                                              =45*23
                                              = 1035
2 4 2
2015-01-22T21:12:48+05:30
1035 is the ans for this question
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