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Question

What is the difference between the largest 3 digit number and the smallest 3 digit number that can be formed using the digits 9, 8, 7 (without any repetition)?

A
198
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B
189
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C
195
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D
206
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Solution

The correct option is A 198
Different 3 digit numbers that can be formed with 9, 8, 7 without any repetitions are:
Number Hundreds Tens Unit
987 9 8 7
978 9 7 8
897 8 9 7
879 8 7 9
798 7 9 8
789 7 8 9
From the above table comparing through place values it can be identified 987 is the largest and 789 is the smallest 3 digit number that can be formed
The difference between the these two numbers = 987 - 789
= 198

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