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CBSE Notes 2011-2012 » XI-Maths

# Sequences and Series

## 4th term of an A.P.is three times the first and the 7th term exceeds twice the third term by 1. Find...

4th term of an A.P.is three times the first and the 7th term exceeds twice the third term by 1. Find the first term and the common difference.

## Find the next two terms of an A.P. given by : (i) 2,5,8,11, ....,......., (ii) 1,-3,-7,-11 , .,... ,...

Find the next two terms of an A.P. given by :
(i) 2,5,8,11, ....,.......,
(ii) 1,-3,-7,-11 , .,... ,
(iii) 2x-3y,x-4y,-5y,-x-6y, ............,
(iv)1,5/6,2/3,1/2,.........,.........,

## The nth term of a progression is 3n + 1, prove that it is an A.P. Find its 6th term.

The nth term of a progression is 3n + 1, prove that it is an A.P. Find its 6th term.

## How many terms are there in the A.P. (i) 10,13,16,.......... , 49 (ii) 7,13,19,........., 199 (iii) ...

How many terms are there in the A.P.
(i) 10,13,16,.......... , 49 (ii) 7,13,19,........., 199 (iii) 14 1/2,12,....... ,-38?