Four balls are numbered 1 through 4 and placed in a box. Two balls are selected without replacement.
Find the probability that
(a)the sum of the numbers is even.
(b)the number on the second ball is less than the number on the first ball.
(c)the sum of the numbers on both balls is greater than 3.

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The Answer of Four balls are numbered 1 through 4 and placed in a box. Two balls are selected without replacement.
Find the probability that
(a)the sum of the numbers is even.
(b)the number on the second ball is less than the number on the first ball.
(c)the sum of the numbers on both balls is greater than 3.

Four Balls Are Numbered 1 Through 4 and Placed in a Box