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第三题,我算出来是14, 求指证:
假设B=2, C=3,D=5,X=7,•Factors of 210: 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210除去1和210 那么就是14个factors
googled:
•Prime factorization: 210 = 2 x 3 x 5 x 7, so 210 is the product of the first four prime numbers!
•The exponents in the prime factorization are 1, 1, 1, and 1. Adding one to each and multiplying we get (1 + 1)(1 + 1)(1 + 1)(1 + 1) = 2 x 2 x 2 x 2 = 16. Therefore 210 has 16 factors.
•Factors of 210: 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210
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