Home
Class 11
MATHS
The sum of first ten terms of an arithme...

The sum of first ten terms of an arithmetic progression is `80` and its third term is `7`. If the ninth term is `a_(9),` then `[a_(9)]` is (where `[.]` denotes greatest integer function) :

Promotional Banner

Similar Questions

Explore conceptually related problems

What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and the last term is 55?

What is the sum of the first 13 terms of an arithmetic progression, if the 5th term is 1 and the 8th term is - 17?

What is the sum of the first 12 terms of an arithmetic progression, if the first term is 3 and the last term is 47?

The sum of the first three terms of an arithmetic progression is 9 and the sum of their squares is 35. The sum of the first n terms of the series can be

If the nth term of an arithmetic progression is 3n+7, then what is the sum of its first 50 terms ?

What to the sum of the first 13 terms of an arithmetic progression if the first term to -10 and last term is 26?

The sum of the first 51 terms of the arithmetic progression whose 2nd term is 2 and 4th term is 8, is ________.