Please answer question in details and with basic explanation

Dear Student,
Please find below the solution to the asked query:

Use the fact that nCr nCr-1=n-r+1rNow1+ nCr nCr-1=n-r+1r+1=n-r+1+rr1+ nCr nCr-1=n+1rP=1+ nC1 nC11+ nC2 nC31+ nC3 nC4......1+ nCn nCn-1Using 1+ nCr nCr-1=n+1r we getP=n+11n+12n+13.....n+1n=n+1nn!

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