The coefficient of

Question:

The coefficient of $x^{7}$ in the expression

$(1+x)^{10}+x(1+x)^{9}+x^{2}(1+x)^{8}+\ldots+x^{10}$ is :

  1. 120

  2. 330

  3. 210

  4. 420

Correct Option: , 2

Solution:

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