Question

find the sum of all two digit natural no. which when divided by 7

Answer 1

The sum of two digit natural no is 877382

Answer 2

The answer is 34,692 .....
Here , D = 7 , A = 14 , N = 98....
Sn = n/2 ( 2a + (n-1) d )
Sn. = 98/2 ( 2 *14 + ( 98 - 1 ) 7 )
Sn. = 49 ( 28 + 679 )
Sn. = 49 * 708
Sn = 34692
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