Two sides are 7 and 10,
sum of two sides should be greater than third side in a triangle.
so 7+1>10 , 8>10 ( false)
7+2>10, 9>10 ( false)
7+3>10, 10>10 ( false)
7+4>10, 11>10 (true)
so the third side should be 4
Option D is correct
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