Posted by **Shin** on Monday, May 6, 2013 at 12:54pm.

A lottery ball drawing machine has 50 balls, each labeled with a distinct integer from 1 to 50. Every Sunday, four different balls are drawn to determine the winning numbers. You have last Sunday's ticket with the numbers {3,7,12,15}. You missed the drawing, but heard that 15 was the largest of the four numbers. How many such sequences of 4 integers are there?

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