Maths-
General
Easy

Question

blank to the power of straight n straight C subscript straight r plus 1 end subscript plus 2 to the power of straight n straight C subscript straight r plus to the power of straight n straight C subscript straight r minus 1 end subscript equals

  1. blank to the power of n plus 1 end exponent C subscript r
  2. blank to the power of n plus 2 end exponent C subscript r
  3. blank to the power of n plus 2 end exponent C subscript r plus 1 end subscript
  4. n plus 2 C subscript r plus 2 end subscript

The correct answer is: blank to the power of n plus 2 end exponent C subscript r plus 1 end subscript


    nC subscript straight r plus 1 end subscript plus to the power of straight n straight C subscript straight r plus to the power of straight n straight C subscript straight r plus to the power of straight n straight C subscript straight r minus 1 end subscript

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