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how many 3-digit numbers can be formed out of the numbers 4 5 6 7 8 9?​

Sagot :

Answer:

For the hundereds digit, there are 3 possibilities i.e 4,5 or 6——(1)

For the ten digit, there are 2 possibilities [As one of the numbers has been used for the ones digit]——(2)

For the hundereds digit, there is 1 possibility [As 2 digits have been used for Hundereds and tens]——(3)

Therefore, The number of digits without repetition is 3*2*1=6

With repetition is 3*3*3=27