Any 4 from 11 is calculated as 11!/(11 - 4)! x 4! The ! sign means factorial so the calculation simplifies to (11 x 10 x 9 x 8)/(4 x 3 x 2) = 11 x 10 x 3 = 330.
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20C2 = 190
6,375,600
2,850
-7
When you have a choice of 7 digits, and cannot repeat any digit, then the first number can be chosen in 7 ways, the second can be chosen in 6 and the third can be chosen in 5. 7 x 6 x 5 = 210