I think the answer is A, we have 25 balls with white, red blue, and they are numbered from 1 to 10, so 5 balls are missing. the choice 1 state that the probability that the ball chosen is white and have even number is 0 then the number the number of white balls is 5 with odd numbers, and the other c...

the answer is 5,
the ten A=6 and c=4 or A=4 and C=6, to have E=1 and F=0, then we are left with 3, 2, 5
obviously we will have G=5
please correct me if wrong

you are saying that k= x/15 must be even, for x=15, which is a multiple of 3, but k is not even.
thank you very tricky question

we have a 4 couples that means 4 Women and 4 men, {w1,w2,w3,w4}, {m1, m2,m3,m4} the first approach: direct one: chose 2 men or women from these two sets, the last one in the one from which we didn't chose from thus: (2c4)*(1c2)*2=24 p.s: be careful here, you must chose the last member from 2, becaus...

Siblings

In a room filled with 7 people, 4 people have exactly 1 sibling in the room and 3 people have exactly 2 siblings in the room. If two individuals are selected from the room at random, what is the probability that those two individuals are NOT siblings?
5/21
3/7
4/7
5/7
16/21

Thank you very much for your help, I got it finally

Thank you Stuart for your prompt reply you said that "While Bill is walking and the other group is standing, Bill's relative speed is 3 f/s. His distance to cover is 120 feet," I think the group is moving as well with rate equal to 3f/s; so bill need to catch up the group first in order to...

moving walk

The ‘moving walkway’ is a 300-foot long walkway consisting of a conveyor belt that moves continuously at 3 feet per second. When Bill steps on the walkway, a group of people that are also on the walkway stands 120 feet in front of him. He walks toward the group at a rate of 3 feet per second. On...