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[求助]one problem from GMATprep

For every positive even integer n, h(n) is defined as the product of all even number from 2 to n, inclusive. If p is the smallest prime factor of h(100)+1, then p is

  1. between 2 and 10
  2. between 10 and 20
  3. between 20 and 30
  4. between 30 and 40
  5. greater than 40

key: E

Please help. NN! Thanks a lot!

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agree!!!

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好像是N!+1的最小质因子大于N

h(100)=2*(50!)

所以...

记不太清了

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