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KVPY 2019 SB SX Exam Previous Papers
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© examsnet.com
Question : 1
Total: 120
PART-I
MATHEMATICS
The number of four-letter words that can be formed with letters a, b, c such that all three letters occur is
30
36
81
256
Validate
Solution:
ways =
3
4
−
3
C
1
.
2
4
+
3
C
2.
1
4
=
81
−
48
+
3
=
36
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