Find the sum of integers between 10 and 500 which are divisible by 7

1.	Find the sum of integers between 10 and 500 which are divisible by 7
Answer» 17885 A=14D=7L=497L=a+(n-1)d497=14+(n-1)7497-14=(n-1)7483=(n-1)7n-1=483/7n-1=69n=70Sn=n/2[2a+(n-1)d]Sn=70/2[2(14)+(70-1)7]Sn=35(28+69*7)Sn=35(511)Sn=17,885

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