In a) there are 2 'L' letters and total 10 letters then probability of getting a L letter= 2/10=1/5
B) the letter E just like above total 10 letters and the letter E is 3 ( 1 E in HELLO and 2 E in THREE)
Probability =3/10
C) the letter L or E is just like There are total 10 letters and 2L and 3E then probability of getting L or E is =5/10= 1/2
D) probability of getting letter E or a consonant = 9/10. that is here O and E are vowels then others are consonants the then only the letter O is the letter we can't take
E)just like others probability of getting The letter L,E or T is =6/10=3/5