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     EduGorilla 
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    A teacher writes all the 3-digit numbers, greater than 499 on the blackboard in a class. He then erases all the numbers in which either all the digits are the same or all are different. No other number is removed. How many numbers are still written on the blackboard?

    Options :-

    1. 124
    2. 134
    3. 135
    4. 140
    5. 360
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