Question

find the sum of all the natural numbers between 10and 200 which are divisible by 7​

Answer 1

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The numbers divisible by 7 are:-

14,21,28,35,42,49,56,63,70,77,84,91,98,105,112,119,126,133,140,147,154,161,168, 175,182,189,195

Sum = 2835

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Answer 2

Answer:

2835

Explanation:

AP formed by multiples of 7 between 10 to 200

=> 14,21,28.......................196.

a= 14,

d= 7

l= 196

=> 14+(n-1)×7= 196

=> n= 27

=> S= ( 27/2) (14+196)

=> 27×210/2

=> 2835