C(n, r) + 2C(n, r + 1) + C(n, r + 2) किसके बराबर है?

  1. C(n + 1, r)
  2. C(n + 1, r + 2)
  3. C(n + 2, r + 2)
  4. C(n + 2, r + 3)

Answer (Detailed Solution Below)

Option 3 : C(n + 2, r + 2)
Free
NDA 01/2025: English Subject Test
30 Qs. 120 Marks 30 Mins

Detailed Solution

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अवधारणा:

गणना:

दिए गए प्रश्न को निम्न रूप में लिखा जा सकता है,

nCr + nCr+1 + nCr+1 + nCr+2

=

=

=

=

=

=

=

=

=n+2Cr+2

= C(n + 2 , r + 2)

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