How many numbers between 0 and one million can be formed using 0, 7 and 8?
Explanation:
Numbers possible with 0, 7, 8:
Possible single-digit numbers = 2
Possible 2-digit numbers = 2 × 3 = 6
Possible 3-digit numbers = 2 × 3 × 3 = 18
Possible 4-digit numbers = 2 × 33 = 54
Possible 5-digit numbers = 2 × 34 = 162
Possible 6-digit numbers = 2 × 35 = 486
Total possible numbers = 486 + 162 + 54 + 18 + 6 + 2 = 728
Hence, option (c).
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