A couple decided to have 3 children B or G, the probability of a B P(B)= and P(G)=1/2

Find the probability that they have "Atleast one " girl.?

1. A dice is rolled 3 times, find the probability of getting "Atleast one" 6?
2. IN the Georgia Fantasy- 5 lottery , balls are numbered from 1 to 39, 5 balls are drawn randomly. To win the lotto you must mark 5 number from 1 to 39 on a ticket and your number must match the number on the 5 balls. What is the probability that you win?
3. If an operation can be performed in m ways, and a second operation can be performed in n ways. Then the total number of ways to perform the sequence of 2 operations is ----------------
4. The number of permutations of 6 object is ----------------------------.