Simplify \(\frac{90}{105}\)
Explanation
doubling gives \(\frac{180}{210}=\frac{18}{21}\) factoring by 3 gives \(\frac{6}{7}\)
Simplify \(\frac {5}{10}\)
How many different passcodes can be formed from the letters {A, B, C, D} if each letter can only be used once?