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Question

Question: In the expansion of \(\left( \sqrt{x^{5}} + \frac{3}{\sqrt{x^{3}}} \right)^{6}\) coefficient of x<su...

In the expansion of (x5+3x3)6\left( \sqrt{x^{5}} + \frac{3}{\sqrt{x^{3}}} \right)^{6} coefficient of x3 is –

A

0

B

120

C

420

D

540

Answer

540

Explanation

Solution

r = nαmα+β\frac{n\alpha - m}{\alpha + \beta}

Ž r = 6×5/235/2+3/2\frac{6 \times 5/2 - 3}{5/2 + 3/2} = 124\frac{12}{4} = 3

\ T4 = 6C3 (3)3 = 540