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Only two matrices of the same order can be added or subtracted.
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Glossary

union

The union of two sets A and B is the set containing all the elements of A and B.

Full Glossary List

This question appears in the following syllabi:

SyllabusModuleSectionTopicExam Year
AQA A-Level (UK - Pre-2017)FP1Matrix algebraMatrix arithmetic-
AQA AS Further Maths 2017Pure MathsMatrices and TransformationsMatrix Arithmetic-
AQA AS/A2 Further Maths 2017Pure MathsMatrices and TransformationsMatrix Arithmetic-
CBSE XII (India)AlgebraMatricesOperations, addition, multiplication and transpose-
CCEA A-Level (NI)FP1Matrix algebraMatrix arithmetic-
Edexcel A-Level (UK - Pre-2017)FP1Matrix algebraMatrix arithmetic-
Edexcel AS Further Maths 2017Core Pure MathsMatricesMatrix Arithmetic-
Edexcel AS/A2 Further Maths 2017Core Pure MathsMatricesMatrix Arithmetic-
Methods (UK)M5Matrix algebraMatrix arithmetic-
OCR A-Level (UK - Pre-2017)FP1Matrix algebraMatrix arithmetic-
OCR AS Further Maths 2017Pure CoreMatrix BasicsMatrix Arithmetic-
OCR MEI AS Further Maths 2017Core Pure AMatrix BasicsMatrix Arithmetic-
OCR-MEI A-Level (UK - Pre-2017)FP1Matrix algebraMatrix arithmetic-
Pre-Calculus (US)E2Matrix algebraMatrix arithmetic-
Scottish Advanced HighersM3Matrix algebraMatrix arithmetic-
Scottish (Highers + Advanced)AM3Matrix algebraMatrix arithmetic-
Universal (all site questions)MMatrix algebraMatrix arithmetic-
WJEC A-Level (Wales)FP1Matrix algebraMatrix arithmetic-