A person wishes to make up as many different parties of 10 as he can out of 20 friends, each party consisting of the same number. The number of ways that the same man is found in different parties is
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a
380
b
19
c
90378
d
92378
answer is D.
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Detailed Solution
The number of ways that the same man is found in different parties is =19c9=92378
A person wishes to make up as many different parties of 10 as he can out of 20 friends, each party consisting of the same number. The number of ways that the same man is found in different parties is