Others Maths Puzzle

An urn contains marbles of four colors: red, white, blue, and green.
When four marbles are drawn without replacement, the following events
are equally likely:
(a) the selection of four red marbles;
(b) the selection of one white and three red marbles;
(c) the selection of one white, one blue, and two red marbles; and
(d) the selection of one marble of each color.
What is the smallest number of marbles that the urn could contain?

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Others Other Question
Q. While in San Francisco some time back, I hired a car to drive over the Golden Gate bridge. 1 started in the ; fternoon when there was no traffic rush. So I could do 40 miles an hour. While returning, however, I got caught in the traffic rush and I could only manage to drive at a speed of 25 miles an hour. What was my average speed for the round trip? 3 real and distinct normals are drawn from (h,0) to y^2=4ax Circle x^2+y^2=16a^2 cuts off chords on these normals. Every chord is bisected by y^2=4ax, PT 4a