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a) Determine how many terms are in the expansion of (2x - 3y) 7 . b) In the expansion of (a+b) 8 , determine the

a) Determine how many terms are in the expansion of (2x - 3y)7.

b) In the expansion of (a+b)8, determine the value of the exponent "k" in the term that contains a5bk ?

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