If a is odd number.the there must exist an integer n such that a2-1=( )A．3nB．5nC．8nD．16n——青夏教育精英家教网——

题目内容

If a is odd number，the there must exist an integer n such that a²-1=（　　）

A．3n

B．5n

C．8n

D．16n

试题答案

C

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