Correct Answer - Option 2 : 21250/7161
Calculation
5/7 + 21/31 + 52/33
LCM of 7, 31 and 33 is 7161
⇒ \(\frac{{\left( {5 \times 31 \times 33} \right) + \;\left( {21 \times 7 \times 33} \right) + \;\left( {52 \times 7 \times 31} \right)}}{{7161}}\)
⇒ (5115 + 4851 + 11284)/7161
⇒ 21250/7161
∴ 5/7 + 21/31 + 52/33 is 21250/7161