5+15+45+....+5.3n-1 = 5/2(3n-1)

see if u look p(1)= 5/2(31-1) is not equal to 5

which implies the given statement is not true for 1..hence it cannot be true for other values of n also.

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Your answer wrong because Sn=5/2 (3^n - 1)
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