Maths-
General
Easy

Question

The value of blank to the power of 50 C subscript 4 plus sum from r equals 1 to 6 of   to the power of 56 minus r end exponent C subscript 3 is

  1. C presuperscript 55 subscript 4
  2. C presuperscript 55 subscript 3
  3. C presuperscript 56 subscript 3
  4. C presuperscript 54 subscript 4

The correct answer is: C presuperscript 54 subscript 4

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usingblank to the power of n C subscript r space end subscript plus to the power of n C subscript r minus 1 end subscript equals to the power of n plus 1 end exponent C subscript r space a n d space to the power of n C subscript r space end subscript plus to the power of n C subscript r plus 1 end subscript equals to the power of n plus 1 end exponent C subscript r plus 1 end subscript
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Given, blank to the power of n P subscript r equals 720 comma to the power of n C subscript r equals 120
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