Elitmus
Exam
Numerical Ability
Permutation and Combination
Two letters are selected at random from the set of English alphabets
what's the probability that
1)both are vowels?
2)both are consonants?
3)one is vowel and the other is consonant?
Read Solution (Total 17)
-
- 1) 5C2/26C2=2/65
2) 21C2/26C2= 42/65
3) (5C1*21C1)/26C2=21/130 - 10 years agoHelpfull: Yes(61) No(4)
- I Love You Anjana Kumari.
- 10 years agoHelpfull: Yes(16) No(14)
- @gaurav kumar
1 and 2 are correct
but i think 3rd is wrong bcoz
event is "1 vowel and 1 consonants"
but according to ur solution it is "1 vowel or 1 consonant"
so the correct solution would be
1 vowel=(5c1)/(26c1)=5/26 and 1 consonant=(21c1)/(26c1)=21/26
and since both are inclusive
so answer will be (5/26)*(21/26) - 10 years agoHelpfull: Yes(8) No(6)
- 1) 2/65
2) 42/65
3) 21/65 - 10 years agoHelpfull: Yes(5) No(2)
- 1. (5c2)/(26c2)=2/65
2. (21c2)/(26c2)=42/65
3. (5+21)/(26c2)=2/25 - 10 years agoHelpfull: Yes(4) No(6)
- 1)5C2/26C2
2)21C2/26C2
3)5C1*21C1/26C2 - 10 years agoHelpfull: Yes(3) No(0)
- 5c2/26c2=2/65
21c2/26c2
5c1.21c1/26c2 - 10 years agoHelpfull: Yes(2) No(0)
- 1) 2/65
2) 42/65
3) 21/130 - 10 years agoHelpfull: Yes(2) No(0)
- ANSWER==>
1. 5C2/26C2 = 10/325= 2/65
2. 21C2/26C2 = 210/325 = 42/65
3. (5C2+21C2)/26C2 = 220/325 = 44/65 - 10 years agoHelpfull: Yes(1) No(11)
- 1. (5c2)/(26c2)
2. (21c2)/(26c2)
3. (5*21)/(25*26)
this is correct - 10 years agoHelpfull: Yes(1) No(0)
- 1) 5C2/26C2=2/65
2) 21C2/26C2= 42/65
3) (5C1*21C1)/26C2=21/130 - 10 years agoHelpfull: Yes(1) No(0)
- 1)Here we have to pick both vowels so,
5c2/26c2=2/65
2)Here we have to pick both consonants so,
21c2/26c2=42/65
3)Here we have to pick one is vowel and the other is consonant so,
according to question we have to perform and operation
(5C1*21C1)/26C2=21/130
- 10 years agoHelpfull: Yes(1) No(0)
- Answer to third will be :
(5/26*21/25)+(21/26*5/25) or 2*21/26*5/25 as either of vowel or consonant can occur in the first and second selection. - 10 years agoHelpfull: Yes(1) No(0)
- 1) (5/26)*(4/25)= 2/65
2) (21/26)*(20/25)= 42/65
3) for vowel (5/26)* for consonant (21/25)= 21/130 - 10 years agoHelpfull: Yes(1) No(0)
- 1) 5C2/26C2=2/65
2) 21C2/26C2= 42/65
3) (5C1*21C1)/26C2=21/65 - 8 years agoHelpfull: Yes(1) No(0)
- you r correct @pandey
- 10 years agoHelpfull: Yes(0) No(0)
- 1. 5c2/26c2
2. 21c2/26c2
3.5c1*21c1/26c2 - 10 years agoHelpfull: Yes(0) No(0)
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