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2) 2p.3p + 2p.3 + 7.3p + 7.3 = 6p^2 + 6p + 21p + 21
= 6p^2 + 27p + 21
3)2.p^3.q^18.p^5.q^6 : 3p^4.q^4 = 2/3.p^3+5-4.q^18+6-4
= 2/3.p^4.q^20