Question

Find the sum of numbers between 1 to 100 divisible by 6

Answer 1

16 numbers are divisible by 6 between 1 to 100

Answer 2

AP=6,12,18.........,96

96=6+(n-1)6

96-6=6n-6

90+6=6n

96/6=n

n=16

Sn=16/2(2*6+(16-1)6)

=8(12+90)

=8*102

=816

Hope it is helpful