Question

Ben chooses a number from among the first 30 counting numbers 1,2.....30. What is the probability that he chooses a number divisible by 6 or by 8?

Answer 1

How many numbers are divisible by 6 or 8? When do the intersect?

Answer 2

5 numbers divisible by 6 and 3 divisible by 8.

Answer 3

Numbers divisible by 8 or 6 between 1 to 30 ≡ {6,8,12,16,18,24,30}

Answer 4

I think you can do it now.

Answer 5

So the probability would be 7/30?

Answer 6

I think so...

Answer 7

Yes.

Answer 8

Thank you!

Answer 9

Wow I like this question and I like Ishaan's answer! Very number theory-ish, Ishaan!

Answer 10

P(A)+P(B)-P(A∩B)=7/30

Answer 11

Because 6(8)=48 and 48>30
so P(A intersect B)=0

you did good too badref! :)

Answer 12

Oh gosh I have myin's approval. X3