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  4. Number of terms free from radical sign in the expansion of (1+31 / 3+71 / 7)10 is -

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Q. Number of terms free from radical sign in the expansion of $\left(1+3^{1 / 3}+7^{1 / 7}\right)^{10}$ is -

Binomial Theorem

Solution:

Correct answer is (c) 6