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How many different triangles are there in the figure shown above?
(a)
28
(b)
24
(c)
20
(d)
16
(A)
There are two identical red, two identical black, and two identical white balls. In how many different ways can the balls be placed in the cells such that balls of the same color do not occupy any two consecutive cells?
15
18
30
(C)
There are 6 different letters and 6 correspondingly addressed envelopes. If the letters are randomly put in the envelopes, what is the probability that exactly 5 letters go into the correctly addressed envelopes?
Zero
1/6
1/2
5/6
In how many different ways can all of 5 identical balls be placed in the cells such that each row contains at least 1 ball?
64
81
84
108
(D)