ConceptSum of First n Terms of an AP

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#### Question

Find the sum of all natural numbers between 250 and 1000 which are exactly divisible by 3

#### Solution

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#### Similar questions VIEW ALL

If *S*_{n} denotes the sum of first *n* terms of an A.P., prove that *S*_{30} = 3[*S*_{20} − *S*_{10}]

Find the sums given below :

–5 + (–8) + (–11) + . . . + (–230)

In an AP

Given a_{n} = 4, d = 2, S_{n} = − 14, find n and a.

If the m^{th} term of an A.P. is 1/n and the n^{th} term is 1/m, show that the sum of mn terms is (mn + 1)

Find the sum of first 30 terms of an A.P. whose second term is 2 and seventh term is 22

#### Reference Material

Solution for concept: Sum of First n Terms of an AP. For the course 8th-10th CBSE