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यदि A = [{:(1,,0),(0,,-1):}] तथा B = ...

यदि A = `[{:(1,,0),(0,,-1):}] ` तथा B = `[{:(0,,1),(1,,0):}]` है तो AB = `[{:(0,,1), (-1,,0):}]` और BA `=[{:(0,,-1), (1,, 0):}]` है | स्पष्टतया AB ` ne `BA है |

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