Example 3： Is p

　　 p/3

　　 -p + x -q + x

　　Multiplying both sides of p/3

　　Hence， is sufficient. As to ， subtract x from both sides of -p + x

　　-q + x， which yields -p -q.

　　Multiplying both sides of this inequality by -1， and recalling that multiplying both sides of an inequality by a negative number reverses the inequality， yields p Hence， is also sufficient. The answer is D.

　　Example 4： If x is both the cube of an integer and between 2 and 200， what is the value of x?

　　 x is odd.

　　 x is the square of an integer.

　　Since x is both a cube and between 2 and 200， we are looking at the integers：

　　which reduce to

　　8， 27， 64， 125

　　Since there are two odd integers in this set， is not sufficient to uniquely determine the value of x. This eliminates choices A and D.

　　Next， there is only one perfect square， 64， in the set. Hence， is suffi　

　　 ABC is the base word.

　　 If C immediately follows B， then C can be moved to the front of the codeword to generate another word.

　　From ， we cannot determine whether CAB is a code word since gives no　rule for generating another word from the base word. This eliminates A and D

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