Question

A four digit numbers is to be formed by using 2,4,7,8. Find the probability that number will start with 7​

Answer 1

Answer:

7/4

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Answer 2

$\red{Answer:}$

let the first digit be fixed as 7. Then other 3 places can be filled in 3! ways

Total numbers that can be formed are 4!

So probability = 3!/4! = 3×2×1/4×3×2×1 = 6/24 = 1/4.

${Answer}$ = 1/4.

hope it helps.

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