Homework SourseThere are 13 people in an office with 4 different phone line
There are 13 people in an office with 4 different phone lines. If all the lines begin to ring at once, how many groups of 4 people can answer these lines?
There are 13 people in an office with 4 different phone lines. If all the lines begin to ring at once, how many groups of 4 people can answer these lines?
Solution
No of ways = 13C4 = 715 (ans)
