✨ Best Answer ✨
P=(a-1)(b-1)(c-1)
=(a-1)(bc-b-c+1)
=abc-ab-ca+a-bc+b+c-1
=abc-(ab+bc+ca)+(a+b+c)-1
✨ Best Answer ✨
P=(a-1)(b-1)(c-1)
=(a-1)(bc-b-c+1)
=abc-ab-ca+a-bc+b+c-1
=abc-(ab+bc+ca)+(a+b+c)-1
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