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If 1.3+2.3^(2)+3.3^(3)+ . . .=n3^(n)=((2...

If 1.3+2.`3^(2)+3.3^(3)+ . . .=n3^(n)=((2n-1)3+b)/(4)`, then a and b are respectively:

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The correct Answer is:
a = n + 1, b = 3
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