ko bt

My favorite hobby is playing football. I started playing in the summer 2 years ago. I play football with my friends every afternoon. We always play football at home. I think it is a very good sport for our health

đố bt

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\(= \frac{1 \cdot 3}{2^{2}} \cdot \frac{2 \cdot 4}{3^{2}} \cdot \frac{3 \cdot 5}{4^{2}} \cdot . . . \cdot \frac{99 \cdot 101}{10 0^{2}}\)

\(= \frac{\left(\right. 1 \cdot 3 \left.\right) \left(\right. 2 \cdot 4 \left.\right) \left(\right. 3 \cdot 5 \left.\right) . . . \left(\right. 99 \cdot 101 \left.\right)}{2^{2} \cdot 3^{2} \cdot 4^{2} \cdot . . . \cdot 10 0^{2}}\)

\(= \frac{\left(\right. 1 \cdot 2 \cdot 3 \cdot . . . \cdot 99 \left.\right) \left(\right. 3 \cdot 4 \cdot 5 \cdot 101 \left.\right)}{\left(\right. 2 \cdot 3 \cdot 4 \cdot . . . \cdot 100 \left.\right) \left(\right. 2 \cdot 3 \cdot 4 \cdot . . . \cdot 100 \left.\right)}\)

\(= 2 \cdot 101 = 202\)