How many numbers are there between 500 & 1000 which have exactly one of their digit as 8?
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8 _ _ , _ 8 _, _ _ 8
Case 1:
If first place is be filled by 5,6,7,9, and at second place 8 is placed, third place can have 5,6,7,9 then the number of such numbers
= 4 x 4
Case 2:
Similarly if first place is 8, such numbers
= 4 x 4
Case 3:
And same goes when last plcae is 8, 4 x 4
Total = 4 x 4 + 4 x 4 + 4 x 4 = 48
Case 1:
If first place is be filled by 5,6,7,9, and at second place 8 is placed, third place can have 5,6,7,9 then the number of such numbers
= 4 x 4
Case 2:
Similarly if first place is 8, such numbers
= 4 x 4
Case 3:
And same goes when last plcae is 8, 4 x 4
Total = 4 x 4 + 4 x 4 + 4 x 4 = 48
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