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Question: The number of rational term in the expansion of (1 + \(\sqrt{2}\)+ \(\sqrt[3]{5}\))<sup>6</sup> is ...

The number of rational term in the expansion of

(1 + 2\sqrt{2}+ 53\sqrt[3]{5})6 is -

A

7

B

10

C

11

D

None of these

Answer

7

Explanation

Solution

(1 + 21/2 + 51/3) 6

power :

006303123060240420600\begin{matrix} 0 & 0 & 6 \\ 3 & 0 & 3 \\ 1 & 2 & 3 \\ 0 & 6 & 0 \\ 2 & 4 & 0 \\ 4 & 2 & 0 \\ 6 & 0 & 0 \end{matrix} seven cases