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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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