The Total number of cards= total number of letters in MATHEMATICS =11.
[tex]n(S)=11[/tex]We know that vowels are A,E,I,O,U.
Let A be the event to choose vowel.
The number of cards that is a vowel is =4
[tex]n(A)=4[/tex]The probability that chooses a vowel is P(A)
[tex]P(A)=\frac{n(A)}{n(S)}=\frac{4}{11}[/tex]Hence the probability that chooses a vowel is 4/11.