Mathematics
There are total 9 terms in an A.P. If the last term and the sum of all the terms are 28 and 144 respectively, then the first term is :
1
7
4
5
Related Questions
The sum of first n terms of an A.P. is (4n2 + 2n). The nth term of the A.P. is :
(6n − 2)
(8n − 2)
(6n + 2)
(8n + 2)
The 5th term of an A.P. is −3 and its common difference is −4. The sum of its first 10 terms is :
−50
−40
−60
−30
The 7th term of an A.P. is −1 and its 16th term is 17. The nth term of the A.P. is :
(3n + 12)
(2n − 5)
(3n + 5)
(2n − 15)