Posted by **Joe** on Tuesday, May 10, 2011 at 4:35pm.

If M=(1*2*3*4*......*1000) + 1, is M prime? I said no because 24001 can only be divided by 1 and itself, but I got a point off. Why is this?

- Math -
**Reiny**, Tuesday, May 10, 2011 at 6:00pm
probably since

1*2*3*4*...*1000 ≠ 24001

(just multiplying the last 3 numbers, 1000*999*998 is already 997002000, and we still have to multiply that by 997 other numbers.)

on the other hand, M is prime.

(I tried to figure out how you got 24000, and just realized that you simply multiplied 1*2*3*4*1000.

Did you not know what the .... in between the numbers meant ???)

- Math -
**Frank**, Tuesday, May 10, 2011 at 6:24pm
Oh i did 1 times 2 times 3 times 4=24, then times the 1000 which is equal to 24000, then on the outside of thefraction it says add 1 so thats how i got 24,001. I don't know what the ...means thats how the problem was written. How does that make it prime though if you don't know the actual number?

## Answer This Question

## Related Questions

- Math - Which of the following is a prime #? a.2 b.19 c.37 d.51 e.67 I choose 2. ...
- math - Can someone help me with prime and composite numbers? Prime numbers are ...
- math - The vertices of a rectangle are R(-5,-5), S(-1,-5), T(-1,1),and U(-5,1). ...
- to ms.sue, writeacher, martha, or vanessa - come up with 1 fraction up to 99 ...
- 4th grade fractions - come up with 1 fraction up to 99 that has 2 different ...
- math - The vertices of a rectangle are R(-5,-5), S(-1,-5), T(-1,1), and U(-5,1...
- math - what is the largest prime less than 1000? explain how you got ypur answer
- Math - One thousand people stood in a very large circle. Each starting with the ...
- IB HL Math - I need to that if there is better way to prove the following: I am ...
- math - Find all the numbers between 1 and 1000 that have 2 their only prime ...

More Related Questions