Question

If $\frac{1}{^{5}C_{r}}+\frac{1}{^{6}C_{r}} =\frac{1}{^{4}C_{r}}$, then the value of $r$ equals to

• A. $4$
• B. $2$
• C. $5$
• D. $3$

Answer 1

Answer: (B)

$2$

Answer 2

Answer (b) $2$