Math, asked by PragyaTbia, 1 year ago

How many 3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated?

Answers

Answered by guravy27
6

digits = 9

let the three digit number is _ _ _

for units place we have 9 options (1,2,3...9 say we write 1) then for tens place we are left with 8 options because repetition is not allowed and similarly for hundreds place we will have 7 options

hence total number of 3 digit number without repetition is 9*8*7 = 504

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