Task: Question Answering
Input (English): Problem: two tracks are parallel . the first track has 6 checkpoints and the second one has 10 checkpoints . in how many ways can the 6 checkpoints of first track be joined with the 10 checkpoints of the second to form a triangle ? 
Options: ['a ) 120', 'b ) 150', 'c ) 200', 'd ) 270', 'e ) 420']
Output (English): e