The value of 20 50 6 0 r r C – = å is equal to :

Question:

The value of $\sum_{r=0}^{20}{ }^{50-r} C_{6}$ is equal to 

  1. ${ }^{51} C_{7}-{ }^{30} C_{7}$

  2. ${ }^{50} C_{7}-{ }^{30} C_{7}$

  3. ${ }^{50} C_{6}-{ }^{30} C_{6}$

  4. ${ }^{51} C_{7}+{ }^{30} C_{7}$

Correct Option: 1

JEE Main Previous Year 1 Question of JEE Main from Mathematics Binomial Theorem and its Simple Applications chapter.
JEE Main Previous Year Sep. 04, 2020 (I)

Solution:

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