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Popular >

20 choose 2

Solution

20c2

Solution

190

Solution steps

= \frac{n !}{r ! ( n - r ) !}

Plug in

n = 20, r = 2

= \frac{20 !}{2 ! ( 20 - 2 ) !}

\frac{20 !}{2 ! ( 20 - 2 ) !} = 190

= 190

Popular Examples

range of 5,9,3,9,4,5,2,6,10,2 range

5, 9, 3, 9, 4, 5, 2, 6, 10, 2

std of 98,92,92,90,86,86,84,82,82,82,82,80,80,76,74,74,72,70,66,60,52 standard deviation

98, 92, 92, 90, 86, 86, 84, 82, 82, 82, 82, 80, 80, 76, 74, 74, 72, 70, 66, 60, 52

p (9, 3)

range of 8,9,11,5,10,13,4,7,9,13,12 range

8, 9, 11, 5, 10, 13, 4, 7, 9, 13, 12

order 67,62,42,41,52,51,69,66,60,43,54,58,42,53,59,49 order

67, 62, 42, 41, 52, 51, 69, 66, 60, 43, 54, 58, 42, 53, 59, 49

Frequently Asked Questions (FAQ)

What is 20 choose 2 ?
The answer to 20 choose 2 is 190