1+1/3+1/92
28) -3a - 3=-2n +3p, for a
30) u=
-2a-3
k

At least two people have the same birthday in a school of 150 students

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4

1. if events a and b are non-overlapping events, how do you find the probability that one or the other occurs? 2. what does it mean if p(a or b) equals 1?