Find general expression of term with power 4 in Binomial Product Coefficients

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Sigma notation for writing binomial expansion of (a+b)^n is
(a+b)^n=∑_(r=0)^n▒(n¦r) n^(n-r) b^r,where,0≤r≤n,(n¦k) is binomial coefficient
(n¦r), read as nCr or “n choose r”. It really signifies the number of choices to select r elements from a group of n elements. It can be calculated as follows:
(n¦r)=n!/(n-r)!r! ,where n!=n(n-1)(n-2)(n-3)…(3)(2)(1)
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Mr. Anil Kumar, it is you who shall be responsible for clearing my doubts in the best possible manner! I really really appreciate your work, thank you so much!

sumanyuagrawal
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very nice explanation, thank you sir.👍

thepug
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bankexam
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yousufahmed
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This is what I was looking for. Eish thank you sir.

LanoMusambazi-srmx
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Really helped me out was very thorough. Thanks for the explanation!

shaurya
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thank you so much sir . huge fan after this video (although it was the first one only)

keytorelaxation
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can we take common region on no line like [0, 5] which will be common for both "s" and "r"

AttiqRehman-tb