a Use the formula n r = n! r! (n r)! to evaluate 6 2 . b Hence state the value of 6 4
Chapter 25, Problem 29(choose chapter or problem)
a Use the formula n r = n! r! (n r)! to evaluate 6 2 . b Hence state the value of 6 4 . c Given that 6 3 = 20, write down the expansion of (x 2)6. Simplify your answer.
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