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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...

Short answer question

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 , .,... ,...

Short answer question

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.

Short answer question

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) ...

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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?

A sequence is given by an = 2 - 3n. Prove that it is an A.P., find its 5th term.

Short answer question

A sequence is given by an = 2 - 3n. Prove that it is an A.P., find its 5th term.

Which term of the A.P. (i) 5,8,11,....... is 320 ? (ii) 4,9,14,........ is 114 ? (iii) 20, 16,12,......

Short answer question

Which term of the A.P.
(i) 5,8,11,....... is 320 ? (ii) 4,9,14,........ is 114 ? (iii) 20, 16,12,...... is - 96 ?

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