Comparing and sorting

Arrange in descending order this fractions:

2/7, 7/10 & 1/2

Result

a = (Correct answer is: 2/7 < 1/2 < 7/10)

Step-by-step explanation:

$$\begin{gathered} a_1={\displaystyle \frac{2}{7}}\doteq 0.2857 \\ {a}_2={\displaystyle \frac{7}{10}}=0.7 \\ {a}_3={\displaystyle \frac{1}{2}}=0.5 \\ {a}_1<a_3<a_2 \\ a=2\mathrm{/}7<1\mathrm{/}2<7\mathrm{/}10 \end{gathered}$$

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