Find the sum of the three digit natural number ,which are divisible by 4
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Ap : 100 , 104...996
a : 100
d -: 4
an : 996
a+(n-1)d=996
100+(n-1)4=996
(n-1)4=996-100
(n-1)4=896
(n-1)=896/4
(n-1)=224
n=225
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