find the sum of 6 multiplications from 100 to 200
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6 multiplications from 100 to 200
102,.......... 198
an=a+(n-1)d
198=102+(n-1)6
96+6=6n
102/6= n
n=17
sn=n/2 [ 2a+(n-1)d]
=17/2 [2 (102)+16×6]
=17/2 [ 204+ 96]
=17/2 [300]
= 17×150
= 2550
SUM OF 6 MULTIPLES IS 2550
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