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

Posted by Muskan Prajapat 6 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Prakash Borana 6 years, 2 months ago

17885

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Pratham Kaushik 6 years, 2 months ago

A=14 D=7 L=497 L=a+(n-1)d 497=14+(n-1)7 497-14=(n-1)7 483=(n-1)7 n-1=483/7 n-1=69 n=70 Sn=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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