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AP EAMCET202022 Sep 2020Morning ShiftMathematicsBinomial TheoremActual

If ^n C₇= ^n C₆ , then ^n C₂=

Options

  1. A858
  2. B13
  3. C1
  4. D78

Correct answer

D. 78

Step-by-step solution

aligned & Given, ^n C₇= ^n C₆ & array l n=7+6=13 If ^n C_x= ^n C_y either x=y . or x+y=n array & ^n C₂= ¹³ C₂= 13 12 2 =13 6=78 aligned Hence, option (4) is correct.

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