evaluate c(19 17)+c(19 18)
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Explanation:
n
C r
=
(n−r)!r!
n!
19
C
18
+
19
C
17
=
18!
19!
+
17!2!
19!
=19+
2
19×18
=19+171
=190
Answer:
c(19+17)+c(19+18)
19c+17c+19c+18c
36c+36c