Question

Find the sum of all odd 2 digit numbers divisible by 3

Answer 1

815 ok so i have solved the sum n attached it....hope it helps

Answer 2

Answer:

Sum of the numbers=855

Step-by-step explanation:

odd 2 digit numbers divisible by 3 are:

15,21,27...........99

This is an AP and

here a=15,d=21-15=6,L=99 ,n=?

we know that

An=a+(n-1)d

So 99=15+(n-1)*6

99-15=(n-1)*6

(n-1)*6=84

n-1=84/6=14

n=1+14=15

Hence total 15 such numbers are there

we know that sum of AP

S=n/2*(a+L)

So sum of these numbers

S=15/2*(15+99)

=15/2*114

=15*57

=855