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(a+b)5 = a5 + pa4b + qa3b2 + ra2b3 + sab4 + b5
= a5 + 5a4b + 10a3b2 + 10a2b3 + 5ab4 + a5, maka
5p -2q +3r = 5(5) - 2(10) + 3 (10)
= 25 - 20 + 30 = 35