One number is selected at random from the four digit numbers that can be formed from the digits 1,2,3,4,5,6,7,
then the probability that it is an odd number is
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The probability that it is an odd number is : 4/7
Total number that can be formed from 1,2,3,4,5,6 & 7 are
7x7x7x7 = 2401 Numbers
Total number which are odd
7x7x7x4= 1372 [In thousands place : All 7 numbers
In Hundereds place : All 7 numbers
In tens place : All 7 numbers
In ones place: only 4 numbers i.e 1,3,5,7 as it has to be an odd number]
so the probability is : (7x7x7x4)/(7x7x7x7) = (1372/2401)= 4/7
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