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How many 3 digit numbers ending with 7 can be formed using the digits 1, 2, 5, 7, 8

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How many 3 digit numbers ending with 7 can be formed using the digits 1, 2, 5, 7, 8 digits cannot be repeated.

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The number should end with 7, 

∴ The units place can be filled by only one ways, the remaining 4 numbers can occupy the hundredth place in 4 ways and the tenth place in 3 ways.

∴ The total number of ways = 4 × 3 = 12 ways.

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