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# NCERT Solutions class-11 Maths Exercise 9.4

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Exercise 9.4

Find the sum to terms in each of the series in Exercises 1 to 7.

1.

Ans. Given:to terms

= [ term of 1, 2, 3, ………..][ term of 2, 3, 4, 5, ………]

=

=

=

=

=

=

=

=

=

2.

Ans. Given: to terms

= [ term of 1, 2, 3, ………..][ term of 2, 3, 4, 5, ………][ term of 3, 4, 5, ………]

=

=

=

=

=

=

=

=

=

=

=

3.

Ans. Given: to terms

= [ term of 3, 5, 7, ………..][ term of 1, 2, 3, 4, ………]2

= =

=

=

=

=

=

=

=

=

=

4.

Ans. Given: to terms

=

= = [By partial fraction]

………

And

= =

5.

Ans. Given:

=

=

=

=

= = 2840

6.

Ans. Given: to terms

= [ term of 3, 6, 9, ………..][ term of 8, 11, 14, ………..]

=

= =

=

=

=

=

=

=

=

7.

Ans. Given: to terms

=

=

=

=

=

=

=

=

=

=

=

Find the sum to terms in each of the series in Exercises 8 to 10 whose terms is given by

8.

Ans. Given:

=

=

=

=

=

=

=

=

9.

Ans. Given:

=

=

=

=

=

10.

Ans. Given:

=

=

=

=

=

=

=

=

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