In four years we have 365×3 + 366 = 1461 days. Hence long months each have a probability 4 × 31/1461 = 124/1461, and short months a probability 120/1461 to occur. Moreover, {Feb} has probability...

In four years we have 365×3 + 366 = 1461 days. Hence long months each have a probability 4 × 31/1461 = 124/1461, and short months a probability 120/1461 to occur. Moreover, {Feb} has probability 113/1461

2. Since there are 7 long months and 8 months with an “r” in their name, we have P(L)=7/12 and P(R)=8/12