1. If a * b = 2a - 3b + ab, then 3 * 5 + 5 * 3 is equal to?
2. If $$p \times q = p + q + \frac{p}{q}{\text{,}}$$ then the value of 8 × 2 is?
3. The value of $$\left( {{\text{1 + }}\frac{1}{x}} \right)\left( {{\text{1 + }}\frac{1}{{x + 1}}} \right)$$ $$\left( {{\text{1 + }}\frac{1}{{x + 2}}} \right)\left( {{\text{1 + }}\frac{1}{{x + 3}}} \right)$$ is?
4. If $$\frac{a}{b}{\text{ = }}\frac{2}{3}$$ and $$\frac{b}{c}{\text{ = }}\frac{4}{5}{\text{,}}$$ then the ration $$\frac{{a + b}}{{b + c}}$$ equal to?
5. If $$\frac{{2a + b}}{{a + 4b}} = 3{\text{,}}$$ then find the value of $$\frac{{a + b}}{{a + 2b}} = ?$$
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