The product of all the prime numbers less than 20
题目
The product of all the prime numbers less than 20
is closest to which of the following powers of 10?
a.10^9b.10^8c.10^7d.10^6e10^5
答案
选C~
20以下的质数有2.3.5.7.11.13.17.19他们乘积为9699690最接近10的7次方
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