solving it by R code

Consider an experiment of rolling a die three times. Calculate the probabilities for the following events

a) Find the probability of getting the same numbers on all three rolls of a die.

b) Find the probability such that the sum of numbers on all three rolls of a die is greater than 6.

c) Find the probability of getting the number 2 on the first and second roll of a die and any number on the third roll of a die.