Question

a four digit numbers is ti be formed using digits 2,4,7and 8 probability that the number will start with 7 is​

Answer 1

Answer:

/4

because n(s)=24. since each number can form 6 four-digit numbers.

7 can form 6 four digit number

n(e)={7248,7284,7428,7482,7824,

7842}

p(e)=n(e)/n(s)=1/4

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Step-by-step explanation:

Answer 2

Answer:

6

Step-by-step explanation:

2,4,7,8

start with 7

7 _ _ _

other three numbers can written in 3! ways

so no.of ways = 3!×1 = 3×2×1×1= 6

probability= 6/24=1/4

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