probality
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?
A. 1/2
B. 2/5
C. 8/15
D. 9/20
9/20
45962145
+ 2548
45964693
555832
× 3369
1872598008
4444888108
÷ 2
2222444054
9857
-75
9782
A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?
A. 10/21
B. 11/21
C. 2/7
D. 5/7
10/21
971893
+ 500
972393
899
× 20
17980
482
÷ 2
241
546
-90
456
In a box, there are 8 red, 7 blue and 6 green balls. One ball is picked up randomly. What is the probability that it is neither red nor green?
A. 1/3
B. 3/4
C. 7/19
D. 8/21
E. 9/21
1/3
985674
+ 895
986569
897
x 9
8073
36912
÷ 3
12304
456
-89
367
What is the probability of getting a sum 9 from two throws of a dice?
A. 1/6
B. 1/8
C. 1/9
D. 1/12
C. 1/9
864029
+ 8769
872798
6785
x 10
67850
12304
÷ 2
6152
12968
-568
12400
Three unbiased coins are tossed. What is the probability of getting at most two heads?
A. 3/4
B. 1/4
C. 3/8
D. 7/8
7/8
984567
+ 8975
993542
9064
x 92
833888
86414
÷ 4
21603.5
12400
-789
11611