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) Wrong answer

Solution:

a1=27≐0.2857 a2=710=0.7 a3=12=0.5  a1<a3<a2  a=2/7<1/2<7/10

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