Question

find the sum of all natural number between 150 and 200 which are divisible by 7 ??????​

Answer 1

Answer:

Answer is 1225.

Explanation:

Answer :

The sum is 1225

Solution :

The numbers from 150 to 200 divisible by 7 are 154,161 ,168,…., 196

Here, a=154,d=7 and tn=196

tn=a+(n−1)d …(Formula )

∴196=154+(n−1)×7 …(Substituting the values )

∴196−154=(n−1)×7

∴427=n−1 ∴n−1=6 ∴n=7

Now, we find the sum of 7 numbers.

Sn=n2[t1+tn] ...(Formula )

=72[154+196)

=72×350

=7×175

=1225

Answer 2

Answer:

The answer is 1225

Explanation:

the explanation is above Hope it will help.