Question

- The sum of all numbers between 100 and 1000 which are divisible by 13 is 37,674

Answer 1

Answer:

explain the question you already answer the question

Answer 2

Answer:

Sum of all the numbers between 100 to 1000 which is divisible by 13 is 37674

Step-by-step explanation:

Just after 100 the number which is divisible by 13 is 104

And just before 1000 the number which is divisible by 13 is 988

From AP formula we know that $T_N=a+(n-1)d$, here a is first term d is common difference

$988=104+(n-1)13$

n-1 = 68

n= 69

Sum of the AP given by

$S=\frac{n}{2}(a+l)$

$S=\frac{69}{2}(104+988)=37674$