Others Maths Puzzle

. How many words can be formed by using all the letters of the word ‘DAUGHTER’ so that the vowels always come together?

a. 5040
b. 4320
c. 720
d. 423

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Others Other Question

How many three digits number can be formed from the digits 2, 3, 5, 6, 7 and 9, which are divisible by 5 and none of the digit is repeated?

a. 5
b. 10
c. 15
d. 20 a+1/a=6 then a^4+1/a^4=?