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Q.

If m number of integers greater than 7000 can be formed with the digits 3, 5, 7, 8, 9 such that no digit is being repeated, then the value of m is

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a

194

b

192

c

196

d

214

answer is B.

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Detailed Solution

5 digit no’s 5P5=120  
4 digit no’s greater than 7000 mus begin with 7,8,9
3×4P3=72 
120+72=192 

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