单选题For what value of a is a Φ 4 = 24?A3B4C6D25/4E8
单选题
For what value of a is a Φ 4 = 24?
A
3
B
4
C
6
D
25/4
E
8
参考解析
解析:
You are told that a Φ b = ab-a. If a Φ 4 = 24, then b = 4 and ab-a = 24. Hence, 4a-a = 3a = 24, so a = 8.
You are told that a Φ b = ab-a. If a Φ 4 = 24, then b = 4 and ab-a = 24. Hence, 4a-a = 3a = 24, so a = 8.
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