Question

what is an essential condition for adding two vectors

Answer 1

U can add two vectors of one vectors head is connected to the other vectors tail ( Triangle law)

U can also add two vectors when their tail tail are connected or head head are connected just by completing the parallelogram and the resulstant added vector would be the diagonal of that parallelogram.

Answer 2

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HERE'S THE ANSWER ✌
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Vector addition is a binary operation, i.e, only 2 vectors can be added at a time.

Vectors can be added algebraically . But the condition is both the vector must have same dimension and of same unit.

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