Question

find the sum of all natural number between 50 and 250 which ate exactly divisible by 6 find t13

Answer 1

13∗6=78

78+156+23478+156+234

=78(1+2+3)=78(1+2+3)

=78∗6=78∗6

=468

In essence, the answer to your question is 468. 

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Answer 2

For the explaination refer to
pic.

however,
The sum of all natural numbers from 50 &250 which are divisible by 6 is 4950.

we know that,
tn=a+(n-1)d
t13=54+(13-1)6
t13=54+12×6
t13=54+72

t13=126.

hope this helps you ! ! !