Question

find the sum of integers whch are divisible by 3 from 11 to 50​

Answer 1

Hey friend...

Here is your answer...  

Sum=n/2(a+l)

Here, n=20

a=12

l=50

Sum=20/2(12 + 50)  

=10*62

=620

HOPE that it will help you.....  

Answer 2

here is your answer mate....

in this A. P.

1st term = 12 and no of terms are (50/3 )-2=16

and last term is 48.

there fore by formula...

S16= 16/2(a+l)

S16=8(12+48)=8(60)=480. ans...

hope you have liked it so.... mark as brainliest