self Maths Puzzle

What is the next number of the following sequence
6,120,504,1320,.....

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self Other Question

SIMPLIPHY
11111333444445555*444444444455/222222999=
The velocity of a falling object is a linear function of the time t it has been falling. If v = 20 when t = 0 and
v = 53 when t = 11, express v as a function of t.