find the sum of three digit numbers which are divisible by 3
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list of 3-digit no divisible by 3
102, 105, .......,999
It's AP
a= 102 ,. d = 3 ,. l= 999
l = a+ (n-1 )d
999 = 102 + (n-1)3
(n-1)3 = 999-102
n-1 = 897/3
n = 299 +1
n = 300
S = n/2× (a+ l)
=300/2 × (102 + 999)
= 150 ×1101
165150
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