How many different number of 4 digits can be formed out of the digits 3, 5 , 6 , 7 , 7, 8 ?
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Since all the five-digit numbers are greater than 7000, we have Number of five-digit integers = 5x4x3x2x1 = 120 A four-digit integer is greater than 7000 if thousandth place has any one of 7, 8 and 9.
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