the vlaue of  21C1−10C1+ 21C2−10C2+ 21C3−10C3+ 21C4−10C4+…+ 21C10−10C10is

the vlaue of  21C110C1+ 21C210C2+ 21C310C3+ 21C410C4++ 21C1010C10is

  1. A

    221211

  2. B

    221210

  3. C

    22029

  4. D

    220210

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    Solution:

     21C110C1+ 21C210C2+ 21C310C3++ 21C1010C10 =21C1+21C2++21C10 10C1+10C2++10C10 =12 21C1+21C2++21C202101=12 21C1+21C2++21C2112101=1222122101=2201210+1=220210

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