How many four digit numbers greater than 5000 can be formed with the digits 4 ,5, 7, 8, and 9?
For 4 digit numbers greater than 5000, at thousands’ place, only 5, 7, 8 & 9 can be placed and remaining 4 digits can be placed in at remaining three places = (4) × 4 x 3 ×2 = 96
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