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I have a question on my problem of the week, it says if n=15!+35!,how many of the nine prime numbers less than 25 are divisors of n? I need help ASAP!!

I have a question on my problem of the week, it says if n=15!+35!,how many of the nine prime numbers less than 25 are divisors of n? I need help ASAP!!
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I have a question on my problem of the week, it says if n=15!+35!,how many of the nine prime numbers less than 25 are divisors of n? I need help ASAP!!

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User Yagmur
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15!+35!=15!(1+(35!-15!)) so I believe 35!-15!+1 is a prime number so we just have to find the primes in 15! so 2,3,5,7,11,13
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User SnowFatal
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