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Question

Using Vn method, if Tn = (3n - 1)(3n + 2), Find the value of K if Vn - Vn1 = K Tn __

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Solution

Tn = (3n - 1)(3n + 2)

Let Vn = (3n - 1)(3n + 2)(3n + 5)

Vn1 = (3n - 4)(3n - 1)(3n + 2)

Vn - Vn1 = (3n - 1)(3n + 2) [3n + 5 - (3n + 4)]

= 9.(3n - 1)(3n + 2)

= 9. Tn

K = 9


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