find the sum of the integers between 100 and 200 that are not divisible by 9
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Answered by
6
a=101 an=199
Sn= n/2*(a+an)
Sn=99/2*(101+199)
Sn=99/2*300
Sn=99*150
=14850
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Answered by
4
That are divisible by 9 are 108,117,.....198
198 = 108 + (n-1)9
n = 11
Sum = 11/2 ( 216 + 90)
= 1683
As there are total 99 nos.between 100 and 200
so 101+ 102.....199
sum = 99/2 ( 202 + 98) = 150×99 =14850
so sum = 14850 -1683 = 13167
198 = 108 + (n-1)9
n = 11
Sum = 11/2 ( 216 + 90)
= 1683
As there are total 99 nos.between 100 and 200
so 101+ 102.....199
sum = 99/2 ( 202 + 98) = 150×99 =14850
so sum = 14850 -1683 = 13167
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