Question: How many ways are there to choose 6 items from 10 distinct items when a) The items in the choices are ordered and repetition is

How many ways are there to choose 6 items from 10 distinct items when
a) The items in the choices are ordered and repetition is not allowed?
b) The items in the choices are ordered and repetition is allowed?
c) The items in the choices are unordered and repetition is not allowed?
d) The items in the choices are unordered and repetition is allowed?

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