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A person is sitting in a car which is at rest. The reaction from the road at each of the four wheels of the car is R. When the car runs on a straight level road, how will the reaction at either of the front wheels vary?
(a)
It will be greater than R
(b)
It will be less than R
(c)
It will be equal to R
(d)
It shall depend on the material of the road
(C)
How many different triangles are there in the figure shown above?
28
24
20
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
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)