Total number less than 3xx10^8 and can b...

Total number less than `3xx10^8` and can be formed using the digits 1, 2, 3 is equal to a. `1/2(3^9+4xx368)` b. `1/2(3^9-3)` c. `1/2(7xx3^8-3)` d. `1/2(3^9-3+3^8)`

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