78! + 79! = 9.0594E+116 if this helps....
2007-12-18 14:55:14 · 7 answers · asked by PhillyT 1 in Science & Mathematics ➔ Mathematics
79
I guess
2007-12-18 15:01:24 · answer #1 · answered by Anonymous · 0⤊ 2⤋
N = 78! + 79!
N = 78!*1 + 78!*79
N = 78!*(79+1)
N = 78!*80
every prime number up to 78 is included, but 79 is not.
Try it with smaller numbers, to see the point.
n = 2! + 3! = 2!*1 + 2!*3 = 4*2!
divisible by 2, but not by 3
n = 2 + 6 = 8
2007-12-18 23:08:55 · answer #2 · answered by Steve A 7 · 0⤊ 0⤋
78! + 79! = 78! (1 + 79) = (78!)(80)
All the primes less than 78 divide 78!
79 is prime but does not divide 78!, and 79 does not divide 80, so it does not divide their product. 79 is the smallest prime that does not divide 78! + 79!
2007-12-18 23:05:39 · answer #3 · answered by wild_turkey_willie 5 · 0⤊ 0⤋
78! + 79! = 78! (1+ 79) = 78! * 80
smallest prime number that does not devide this is > 78 and it does not devide 80
so it is 79 as 79 is a prime and does not devide 80
2007-12-18 23:07:08 · answer #4 · answered by Mein Hoon Na 7 · 0⤊ 0⤋
78!+79! = 78! (1+79) = 78! * 80
Clearly 79 is the smallest prime that doesn't divide 78!* 80
If p is less than 79 then p divides 78!
But 79 doesn't divide 78!.
2007-12-18 23:01:05 · answer #5 · answered by Theta40 7 · 4⤊ 1⤋
i thought 78 +79 equaled 157...
and if thats what u meant the smalllest prime number would be 159
2007-12-18 22:59:38 · answer #6 · answered by TIFFY 2 · 0⤊ 4⤋
83
2007-12-18 23:01:56 · answer #7 · answered by DANIEL G 6 · 0⤊ 2⤋