Math, asked by Ajina, 1 year ago

If the coeffient of 2nd 3rd 4th term in the expansion of (1+x)^n are in A. P. Then show that n^2-9n+14=0

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Answered by mathdude200

3

Please find the attachment

Attachments:

Ajina: How you take nC1 nC2 nC3

Ajina: Is there any other method

mathdude200: Using n C r-1

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