[機經] MATH 33
33/106
數列An+1=An+3,問A100能否被3除(is divisible by 3)
(1)A1=1
(2)A99不能被3除
Hang13:由1 A100=A1+3*99,不能
2 不能
D each能推出都不能被3整除
看不太懂解釋在寫啥...
An+1=An+3...這是什麼意思?
請各位大大幫我解惑一下了Orz
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