How many 4 digit number each greater than 6000 can be formed by using 5,6,7,8 without repetition?

or:How many 4 digit number each greater than 6000 can be formed by using 5,6,7,8 without repetition?or:3 ways to choose the first digit4 etc5 etc6 et

or:How many 4 digit number each greater than 6000 can be formed by using 5,6,7,8 without repetition?

or:3 ways to choose the first digit4 etc5 etc6 etc3 x 4 x 5 x 6 = 360 with repetition3 x 3 x 2 x 1 = 18 without repetition

Tags:repetition,