Find the sum of21C0 +21C1 +21C2 +21C3 +21C4 + .......... +21C10.

Dear Student,
Please find below the solution to the asked query:
21C0+21C1+21C2+21C3+21C4+...+21C10=1+21+21×201×2+21×20×191×2×3+21×20×19×181×2×3×4+...+21×20×19×18×...×121×2×3×4×...×10
Hope this information will clear your doubts about Binomial theorem.
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