Given three sides, check whether triangle is valid or not.
Input : a = 7, b = 10, c = 5 Output : Valid Input : a = 1 b = 10 c = 12 Output : Invalid
Approach: A triangle is valid if sum of its two sides is greater than the third side. If three sides are a, b and c, then three conditions should be met.
1.a + b > c 2.a + c > b 3.b + c > a
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