1 by 3 minus 1 by 4 into minus 2 by 7 + 7 by 9 into 1 by 7 plz slove by using appropriate properties
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= ( 1/3 - 1/4 ) × ( - 2/7 + 7/9 ) × ( 1/7 )
= 1/12 × 31/21 × 1/7
= 31/1764
i know till this much only
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