Find the sum of all integers between 84 and 179 which is multiplied by 5
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The multiples of 5 between 84 to 179
85,90,95,100,................170,175
a=85, d=90-85=5, l or An= 175
An= a+(n-1)d
175=85+(n-1)5
175-85=5n-5
90+5=5n
5n=95
n=95/5=19
Sn=n/2 (a+l)
= 19/2 (85+175)
=19/2 ( 260)
19/2*260
19*130= 2470.
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