A license

A license plate has 
three letters followed by four numbers. Repeats are not allowed for the letters, but they are for the numbers. If they are issued at random, what is the probability that the three letters are in alphabetical order and the three numbers are consecutive?

Correct answer:

p =  3.0E-5

Step-by-step explanation:

n1=26 25 24=15600 n2=104=10000  n=n1 n2=15600 10000=156000000  a1=25 1 1=25 b1=9 1 1 10+10 9 1 1=180 p=na1 b1=15600000025 180=1040003=3.0105



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