Sighal lequnes tho uu3. Four children are running a race.(i) In how ma

1.	Sighal lequnes tho uu3. Four children are running a race.(i) In how many ways can the first two places be filled?(ii) In how many different ways could they finish the race?
Answer» out of 4 only two can be in first two placeand only one child can be at one placeso nCr = 4C2= 4!/2!2!=6 they can finish in 4! ways24 ways

Sighal lequnes tho uu3. Four children are running a race.(i) In how many ways can the first two places be filled?(ii) In how many different ways could they finish the race?

Answer»

out of 4 only two can be in first two placeand only one child can be at one placeso nCr = 4C2= 4!/2!2!=6

they can finish in 4! ways24 ways