How many 3-digit number can be formed by using the digits 1to9 if no digit is repeated ?
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Hey friend your answer is.....
126 numbers can be formed by them..
126 numbers can be formed by them..
ved2860:
hey bro ans is wrong
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_9_ ×_8_ × _7_
the hundreds place can be filled in 9ways
the tens place can be filled in 8ways
the units place can be filled in 7ways
therefore total ways of arranging = 9×8×7=504ways by principle of multiplication of counting.
I hope this will help you
the hundreds place can be filled in 9ways
the tens place can be filled in 8ways
the units place can be filled in 7ways
therefore total ways of arranging = 9×8×7=504ways by principle of multiplication of counting.
I hope this will help you
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