Answer:
3. 1 / 4
4. 1 / 28
5. Idk sry.
6. 35
7. 28
8. 1 / 32
9. Idk sry.
10. 48
Step-by-step explanation:
3. So there are 16 marbles in the bag, so if you take a green, it's 1/2, and then another, 1/2.
1/2 * 1/2 = 1/4
4. So there are 16 marbles again. One red would be 5 / 16, one blue would be 1 / 5, and one green would be 4 / 7
5 / 16 * 1 / 5 * 4 / 7 = 20 / 560 = 1 / 28
5. Pick 7 out of 7, the formula is C = n! / r!(n - r)!
n = 7
r = 7
Idk sry
6. Pick 3 out of 7
n = 7
r = 3
C = 7! / 3!(7 - 3)!
C = 5040 / 6 * 24
C = 35
7. Pick 2 out of 8
n = 8
r = 2
8! / 2!(8 - 2)!
40320 / 2 * 720
C = 28
8. You have 2 tails and 3 heads.
Say you get the first two tails.
That's 1 / 4
Then you have to get the rest heads.
1 / 8
1 / 4 * 1 / 8 = 1 / 32
9. Idk sry.
10. Multiples of 3: 33
Multiples of 5: 21
Multiples of 15: 6
33 + 21 - 6 = 48
