# ICSE Class 10 Maths Sum of n Terms of an A.P.

- The sum of n natural number is 5n2 - 4n, find its 8th term
- Find the sum of all even numbers between 10 and 100.
- How many terms of the A P 17,15,13,11..... must be added to get the sum 72?
- if the sum of P terms of an arithmetic progression is equal to some of its Q terms. prove that the sum if(P+Q) terms of it is equal to zero
- determine the sum of all natural numbers between 2 and 100 which are exactly divisible by 3
- What is the commen difference if the sum of first 10 terms of an arithmatic sequance is 320and the sum of first to 15 terms is 705
- a part
- If the ratio of the sum of two A.P is 5n+4:9n+6,then the ratio of the 18th term of those A.P is=?
- Find five numbers in A.P whose sum is 12 and the ratio of the first to the last terms is 2:3.
- If the sum of first 20 terms of an A.P. is same as the sum of its first 28 terms,find the sum of its 48 terms

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