Answer:
P( green or blue) = 9/20
P( green, yellow or blue) = 3/4
P( green, red or blue) = 7/10
Step-by-step explanation:
There are 40 slips in all, Green: 15, Red: 10, Blue: 3, Yellow: 12.
P( green or blue) = green or blue / total
= (15 + 3)/ 40
= 18/40
= 9/20
P( green, yellow or blue) = green yellow or blue / total
= (15+12 + 3)/ 40
= 30/40
= 3/4
P( green, red or blue) = green red or blue / total
= (15+10 + 3)/ 40
= 28/40
= 7/10