Wednesday, 12 September 2012

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find the sum of all the integers which are multiplies of7 lying between 200 and 400
1)8379
2)8279
3)8579
4)8729
 
sol>
203+207+217+...+399
t=a+(n-1)d
399=203+(n-1)7
so n=29
sum=n/2(a+l)
so sum=29/2(203+399)
so sum=8729
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