the sum of all 3 digit numbers which are formed by the digits 1,4,7 without repetition of digit is?
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Answer:
147+174+417+471+714+741 = 2664
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Given : 3 digit numbers which are formed by the digits 1,4,7 without repetition of digit
To Find : sum of all 3 digit numbers
Solution:
3 digit numbers which are formed by the digits 1,4,7
1st digit can be selected in 3 ways
2nd digit can be selected in 2 ways
and 3rd digit in 1 way
Hence 3 *2 * 1= 6 numbers
147 , 174 , 417 , 471 , 714 , 741
Sum = 147 + 174 + 417 + 471 + 714 + 741
= 2664
Sum of all 3 digit numbers which are formed by the digits 1,4,7 without repetition of digit is 2664
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