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If Sn = 2/3(2^n-1), find T4.

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If Sn = 2/3(2n-1), find T4.

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Sn = 2/3(2n-1)

we have to find 4th term. Therefore, put n = 3

T4 = 2/3 × 23

= 2/3 × 8 = 16/3

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