A four digit number is to be formed using the digits 1,2,3, 4, 5,6,7 (no digit is being repeated in any number) . Then , the probability that it is `g
A four digit number is to be formed using the digits 1,2,3, 4, 5,6,7 (no digit is being repeated in any number) . Then , the probability that it is `gt 4000` , is
A. `3//2`
B. `1//2`
C. `4//7`
D. `3//7`
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Correct Answer - C
Total cases = `""^(7)P_(4) = 840`
Favourable cases `= 4 xx 6 xx 5 xx 4 = 480`
`therefore` Required probability = `(480)/(840) = (4)/(7)`
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