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NDA2015MathematicsBinomial TheoremActual

What is ( _ r=0 ^1 n+r n ) equal to?

Options

  1. A( n+2 1 )
  2. B( n+3 n )
  3. C( n+2 n )
  4. D( n+2 n+1 )

Correct answer

A. ( n+2 1 )

Step-by-step solution

( _ r=0 ^1 n+r n = n n + n+1 n =1+(n+1)=n+2= n+2 1 )

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