Probability question, please help :) (1 Viewer)

[wootwoot1234]

question:

14. A card is chosen at random from a set
of 10 cards numbered 1 to 10. A second
card is chosen from a set of 20 cards
numbered 1 to 20. Find the probability
that the combination number these cards
make is
(a) 911
(b) less than 100
(c) between 300 and 500.

please include explanation where possible. thanks in advance!

 

[wootwoot1234]

thanks lath!

repped

 

[lath]

question:

14. A card is chosen at random from a set
of 10 cards numbered 1 to 10. A second
card is chosen from a set of 20 cards
numbered 1 to 20. Find the probability
that the combination number these cards
make is
(a) 911
(b) less than 100
(c) between 300 and 500.

please include explanation where possible. thanks in advance!

a) 1/200 (1/10 * 1/20)
b) 81/200 (11-19, 21- 29, 31-39....91-99)
c) 20/200 (311-320, 411-420)