the sum of all natural numbers between 200 and 400 which are divisible by 7
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203 + 210 ...... + 399
a= 203. tn = 399 d= 7
tn = a+(n-1)d
399= 203+(n-1)7
n=29
s29 = 29/2 [ 2(203) + (29-1)(7) ]
s29 = 8729
a= 203. tn = 399 d= 7
tn = a+(n-1)d
399= 203+(n-1)7
n=29
s29 = 29/2 [ 2(203) + (29-1)(7) ]
s29 = 8729
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