The first 24 digits of π are 3.14159265358979323846264…. Record a1, a2, L, a24 as any permutation of the 24 numbers. Then the product (a1-a2)(a3-a4)L(a23-a24) must be divisible by how many.
π的前24位数字为3.14159265358979323846264…．记a1、a2、L、a24为该24个数字的任一排列．则乘积(a1-a2)(a3-a4)L(a23-a24)肯定能被多少整除．
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