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求助一道数学题， 题没太懂~多谢诸位了
1.
Is S is the infinite sequence
S1=9 , S2=99 , S3=999....Sk=10的k次方 -1
Is every item in S divisible by the prime number P?
(1) P is grater than 2
(2)At least one term in sequence S is divisible by P
答案：E
求样解 谢谢 |
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