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Two planes intersect in a line in inverse, converse and contrapositive

User Jack Shedd
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Answer:

Converse: If their intersection is a line, then two planes intersect. Inverse: If two planes didn't intersect, then their intersection is not a line. Contrapositive: If their intersection is not a line, then the two planes didn't intersect.

Explanation:

User Gordon Guthrie
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