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Common Ratio

a Find the fi...

Question

(a) Find the first term of G.P. in which S₆ = 1365 and r = 4

(b) Find the common ratio of a G.P. in which S₂ = 6 and a = 2

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Solution

(a) It is given that and .

We know that .

Hence, the first term of the G.P. is 1.

(b) It is given that and .

We know that .

We know that .

∴.

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