Question

Ram put some buttons on the table. There were 4
blue, 7 red, 3 black and 6 white buttons in all. All
of a sudden, a cat jumped on the table and knocked
out one button on the floor. What is the probabil-
ity that the button on the floor is blue?​

Answer 1

Answer:

1/5

EXPLAINATION

TOTAL NUMBER OF BALLS: 4+7+3+6 = 20

NUMBER OF BLUE BALLS: 4

PROBABILITY THAT BALL KNOCKED IS BLUE = NUMBER OF BLUE BALLS / TOTAL NUMBER OF BALLS

=4/20

=1/5