1) Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random.What is the
probability that the ticket drawn has a number which is a multiple of 3 or 5?

2) If a box contains 10 bulbs,of which just three are defective. If a random sample of five bulbs is drawn, find the probability that the sample contains no defective bulbs.

3) Two dices are tossed. The probability that the total score is a prime number is:

4) A brother and a sister appear for an interview against two vacant posts in an office. The probability of the brother???s selection is 1/5 and that of the sister???s selection is 1/3. What is the probability that only one of them is selected?

5) A card is drawn from a pack of 52 cards. The card is drawn at random. What is the probability that it is neither a spade nor a Jack?

6) 67.39 -11.78 + 19.63 =? + 22.41

7) 22% of 250 + 35% of 460 = ?

8) 0.6 x 1.8??0.5 x 12 = ?

9) 55 x (25)3 ?? 625 = (5)?

10) ? % of 400 - (7)2 = 159