1.The value of ∑r=022(22r)(2322−r)\sum_{r=0}^{22} \binom{22}{r} \binom{23}{22-r}∑r=022(r22)(22−r23) isa.(4523)\binom{45}{23}(2345)b.(4423)\binom{44}{23}(2344)c.(4524)\binom{45}{24}(2445)d.(4422)\binom{44}{22}(2244)Login to continueOnly logged in users canattempt or see the solution.
