Bonus problems need it done by TOMMOROW!!

help123 · #1 $Old$ 11-05-2008, 01:02 PM

If you take all the prime numbers less than 1,000,000 and multiply them together, what will be the last digit of the answer?????

(Headbang )

Soroban · #2 $Old$ 11-05-2008, 08:20 PM

Hello, help123!

Did you even try ?

Quote:

If you take all the prime numbers less than 1,000,000 and multiply them together,
what will be the last digit of the answer?

The primes are: . 2, 3, 5, 7, 11, . . .

Start mutiplying . . .

. . $\begin{array}{ccc}2 \times 3 &=& 6 \\ \times 5 &=& 30 \\ \times 7 &=& 210 \\ \times 11 &=& 2310 \\ \vdots & & \vdots \\ & & duh!\end{array}$

help123 · #3 $Old$ 11-06-2008, 01:51 PM

thank you thank you