F.5 MATHS probability

1.jane and zita plan to meet in a shopping mall .The probability that jane will be late is 0.25 and the probability that zita will be late is 0.3.Find the probability that both of them will not be late

A 0.075
B 0.175
C 0.225
D 0.525

2.A bag contains 3 red balls and 5green balls .If two balls are drawn at random from the bag one by one without replacement , find the probability that the two balls drawn are of the same colour.

A 3/28
B 13/28
C 17/28
D 17/32

3.A specialist predicts that the probability that Hang Sang Index will increase to 20300 and 20400 on a day are 0.4 and 0.15 respectively.
Given that hang sang index has increased to 20300 on that day , find the probability that hang sang index will increase to 20400 on that day

A 0.06
B 0.15
C 0.375
D
0.4

4.6 persons are chosen at random from 9 boys and 8 girls .find the probability that the numbers of boys and girls chosen are different

A 84/221
B 135/221
C 137/221
D 437/442