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Eamcet Mathematics
Algebra Permutations And Combinations
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Q.
If
n
C
r
denotes the number of combinations of n things taken r at a time, then the expression
n
C
r+1
+
n
c
r-1
+ 2 ×
n
C
r
equals
A.
n+2
C
r
B.
n+2
C
r+1
C.
n+1
C
r
D.
n+1
C
r+1
E.
None of the above
View Answer
Correct choice: B
Explanation:
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