Question

Computer keyboard failures can be attributed to electrical defects or mechanical defects. A repair facility currently has 25 failed keyboards, 6 of which have electrical defects and 19 of which have mechanical defects. a. How many ways are there to randomly select 5 of these key boards for a thorough inspection

Answer 1

Number of ways selection 5 key = 53,130

Explanation:

Given:

Number of failed keyboard = 25

Number of electrical defects = 5

Number of mechanical defects = 19

Find:

Number of ways selection 5 key

Computation:

nCr

₂₅C₅

⇒ 25! / [5!(25! - 5!)]

⇒ 25! / [5!(20!)]

⇒ 53,130

Number of ways selection 5 key = 53,130