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Deepak singh 1 Best Answer
Refer attached
how do you know it's under multiplication operation?
doubt
yes , in question they has not described about operation. Then there should be misprint ..
yes , matrix multiplication is always associative .
in all spaces?
in field only .
what do you meean by field?
for example - Real numbers and Complex no. are fields
then what do we mean by space?
vector space