Question

find the sum of the series if they are in G.P. 128, -96, 72, .......... to 11 terms.​

Answer 1

Answer:

ANSWER

Let a,ar,ar

2

,ar

3

be 4 terms

Sum of Extreme a+ar

3

=112

sum of Middle ar+ar

2

=48

⟹

r+r

2

1+r

3

=

3

7

⟹3r

3

−7r

2

−7r+3=0

⟹r=3,−1,

3

1

where −1 doesnot fit to solution..

Let r=3

a(3)+a(3)

2

=48⟹a=4

so the 4 terms are 4,12,36,108

Step-by-step explanation:

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Answer 2

Answer:

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