Question

a popular brand of pen is available in 10 colors and 4 writing tips. how many different choices of pens do you have with this brand?
there are \\(\square\\) different choices of pens with this brand.

Explanation:

Step1: Identify the principle

This is a problem of counting the number of combinations using the multiplication principle. For each color, there are 4 writing tips. So we multiply the number of colors by the number of writing tips.

Step2: Apply the multiplication principle

Number of colors = 10, Number of writing tips = 4. So total choices = \(10\times4\)

Step3: Calculate the result

\(10\times4 = 40\)

Answer:

40