Question 94936
Urn#1 .4*.7=.28
Urn#2 .6*.8=.48
.28+.48=.76
Notice that the probabilities don't add up to 1.00
That's because we have excluded the possibility of getting a red ball from either of the urns. (the missing .24)
{{{.48/.76=12/19}}}probability the ball came from urn#2
EdJones