वन अपॉन 3 माइनस वन अपऑन सेवेन
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1/3 - 1/7
take the LCM of 3 and 7 which is 21
and then obtain the that how many times 3 equals to 21 that is 7 same with 7 how many times 7 equals to 21 that is 3 then multiply 7 & 3 with the numerator and the subtract 3 from 7 answer will be 4/ 21
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