1. C.
2. C.
3. A.
4. D.
5. A.
P = 6*5*4*3*2*1 = 720
6. A.
P = 5*4*3*2*1
2*1
= 120
2
= 60
7. C.
P = 5*4*3 = 60
8. D
P = 11*10*9*8 = 7,920
9. 16
tossing a coin once, we get 2*1 outcomes: (H, T)
tossing a coin twice we get 2*2=4 outcomes: (HH, HT, TH, TT)
tossing a coin thrice, we get 2*3=8 outcomes: (HHH, HHT, HTH, THH, TTH, THT, HTT, TTT)
tossing a coin 4 times we get 2*4 = 16 outcomes.
10. C.
C. (10,2)
C = 10*9
= 45
11. B.
12. A.
C(9,3) = 9*8*7 = 504 = 84
3*2*1 6
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Answers & Comments
1. C.
2. C.
3. A.
4. D.
5. A.
P = 6*5*4*3*2*1 = 720
6. A.
P = 5*4*3*2*1
2*1
= 120
2
= 60
7. C.
P = 5*4*3 = 60
8. D
P = 11*10*9*8 = 7,920
9. 16
tossing a coin once, we get 2*1 outcomes: (H, T)
tossing a coin twice we get 2*2=4 outcomes: (HH, HT, TH, TT)
tossing a coin thrice, we get 2*3=8 outcomes: (HHH, HHT, HTH, THH, TTH, THT, HTT, TTT)
tossing a coin 4 times we get 2*4 = 16 outcomes.
10. C.
C. (10,2)
C = 10*9
2
= 45
11. B.
12. A.
C(9,3) = 9*8*7 = 504 = 84
3*2*1 6