(b)
If three fair coins were tossed 32 times, how many times would you
expect to obtain:
( 3 heads.
(ii) 2 heads,
(iii) I head,
(iv) O heads?

4960, 496, 32, 0

Step-by-step explanation:

1) 3 heads: C(₃₂,₃) = (32 x 31 x 30) / (3 x 2 x 1) = 4960

2) 3 heads: C(₃₂,₂) = (32 x 31) / (2 x 1) = 496

3) 1 head: C(₃₂,₁) = (32) / (1) = 32

4) 0 head: 1

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-2

7 - 9 = -2

reversed:

-2 + 9 = 7