Write the expression ^n C_ r+1 + ^n C_ r-1 +2 ^n C_ r-1 in the simplest form.

^n C_ r+1 + ^n C_ r-1 +2 ^n C_ r-1 =( ^n C_ r+1 + ^n C_ r )+ ^n C_ r + ^n C_ r-1 = ^n+1 C_ r+1 + ^n+1 C_ r = ^n+1+1 C_ r+1 = ^n+2 C_ r+1

Write the expression ^n C_ r+1 + ^n C_ r-1 +2 ^n C_ r-1 in the si…

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