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How many 4-digit numbers can be made by using digits 1 to 7 (repetition is...

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How many 4-digit numbers can be made by using digits 1 to 7 (repetition is not allowed), if the digit 4 will always be there in the number?a) 272b) 480c) 289d) 270

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How many 4-digit numbers can be made by using digits 1 to 7 (repetition is not allowed), if the digit 4 will always be there in the number?a) 272b) 480c) 289d) 270

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