Question

If the letters of the word $PROBABILITY$ are written down at random in a row, the probability that two $B^{\prime }$s are together is

• A. $2/11$
• B. $10/11$
• C. $3/11$
• D. $6/11$

Answer 1

The correct option is A $2/11$

Two $B$'s can be together in $\frac{10!}{2!}$ ways and the total number of ways $=\frac{11!}{2!2!}$.