1.If nPr=nPr+1^{n}P_{r} = ^{n}P_{r+1}nPr=nPr+1 and nCr=nCr−1^{n}C_{r} = ^{n}C_{r-1}nCr=nCr−1, then the value of rrr is equal to:a.111b.444c.222d.333Login to continueOnly logged in users canattempt or see the solution.
