1) In how many ways can the letters of the word EDUCATION be arranged so that the word begins with a Vowel?
2) Find the value of 'n' if (n+1) ! = 2 x (n-1) !
3) How many numbers divisible by 5 and lying between 4000 and 5000 can be formed from the digits 4, 5, 6, 7, 8. ?
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