If n C r denotes the number of combination of n things taken r at a time, then the expression n C r + 1 + n C r − 1 + 2 x n C r equals

Question

If n C r ​ denotes the number of combination of n things taken r at a time, then the expression n C r + 1 ​ + n C r − 1 ​ + 2 x n C r ​ equals

TestHub · Accepted Answer

After t; velocity = f × t V B A ​ = f ​ t + ( − u ) = f 2 t 2 + u 2 − 2 f u t cos α ​ For max. and min. dt d ​ ( V BA 2 ​ ) = 2 f 2 t − 2 fu cos α = 0 or t = f u c o s α ​ Therefore, total no. of values of r = 33 .

Mathematics - Binomial Theorem Question with Solution | TestHub

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