Question

Fifteen persons among whom are A and B, sit down at

random at a round table. It p is The probability that there are exactly any 4 persons between A and B then 14 p =

• A. 4
• B. 8
• C. 2
• D. None of these

Answer 1

Answer: (C)

2

Answer 2

favorable = $\left( { } ^ { 13 } \mathrm { C } _ { 4 } \times \square 4 \right)$ × × 2!

= (13 × 12 × 11 × 10) × $\lfloor 2$ × = ×

Total = = $\mathbf { 1 4 }$

p = $\frac { 1 } { 7 }$ = 2