What will be the difference between the largest and smallest four digit number made by using distinct single digit prime numbers?
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difference between largest and smallest 4 digit no is 8999
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Ans. The number of numbers which are divisible by 1 and itself only =25
Also, the number of numbers which are divisible by at least one more number except 1 and itself(i.e., composite numbers) 99-25=74
So, required difference =74-25=49
So---- 49 will be the answer
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