a) 242
b) 243
c) 728
d) 729
Answer: a
Explanation: The digits to be used are 0,6 and 9
The required numbers are from 1 to 99999
The numbers are five digit numbers.
Therefore, every place can be filled by 0, 6 and 9 in 3 ways.
Total number of ways = 3 × 3 × 3 × 3 × 3 = 35
But 00000 is also a number formed and has to be excluded.
Total number of numbers,
= 35 – 1
= 243 – 1
= 242
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