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If we have 2 elements A and B. if the valency of A is 5 and valency of B is 2, so how to find that the valency of A and B is either positive or negative? |
| Answer» If we have 2 elements A and B. if the valency of A is 5 and valency of B is 2, so how to find that the valency of A and B is either positive or negative? | |