how many seven digit numbers are available, given restrictions that the first three digits can not be 911 or 411, the first digit can not be a 1 or 0?
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Correct option is B 60254 Digit in hundreds's place= 2 Digit in ones' place= 2x2 = 4 Digit in thousands' place=0 Digit in ten-thousands'place= 2+4= 6
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