The probability of arranging $\alpha, \alpha, \alpha, \alpha, \beta, \beta$ such an order that no tw

Question

The probability of arranging $\alpha, \alpha, \alpha, \alpha, \beta, \beta$ such an order that no two $\alpha$ 's are adjacent is

Professor PC Thomas Classes · Answer

Arranging identical items with gap restrictions. $4 \alpha$'s create 5 gaps for $2 \beta$'s