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?????
Hello, help123!
Did you even try ?
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 . . .
. . $\displaystyle \begin{array}{ccc}2 \times 3 &=& 6 \\
\times 5 &=& 30 \\ \times 7 &=& 210 \\ \times 11 &=& 2310 \\
\vdots & & \vdots \\ & & duh!\end{array}$