Question

The sum of natural number which is less than 100 which are divisible by 7

Answer 1

the sequence of the number divisible by 7 is 7,14,21.........,98 which form an AP of first term 7 ,last term=98and CD =4

let 98 be 'n" term of the AP

then, A n=98

A+(n-1)d=98

7+(n-1)7=98

n-1=13

n=14

now, S 14=(14÷2)(7+98)

=735

HOPE IT HELP YOU

Answer 2

Answer:the sequence of the number divisible by 7 is 7,14,21.........,98 which form an AP of first term 7 ,last term=98and CD =4

let 98 be 'n" term of the AP

then, A n=98

A+(n-1)d=98

7+(n-1)7=98

n-1=13

n=14

now, S 14=(14÷2)(7+98)

=735

HOPE IT HELP YOU