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KEAM 2018 Math Paper
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© examsnet.com
Question : 32
Total: 120
A letter is taken at random from the word “GTATISTICS” and another letter is taken at random from the word “ASSISTANT”. The probability that they are same letters is
1
45
13
90
19
90
5
18
9
10
Validate
Solution:
Probability of take a random from the word STATISTICS
=
10
C
1
Probability of take a random from the word ASSISTANT
=
9
C
1
The probability is that they are same letters
T
,
A
,
I
,
S
=
3
C
1
×
3
C
1
+
1
C
1
×
2
C
1
+
2
C
1
×
1
C
1
+
2
C
1
×
3
C
1
10
C
1
×
9
C
1
=
9
+
2
+
2
+
6
90
=
19
90
© examsnet.com
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