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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