\(\left[ {\left( {1 + \frac{1}{2} + \frac{1}{3} + \frac{1}{4}} \right) \times \left( {\frac{1}{2} + \frac{1}{3} + \frac{1}{4} + \frac{1}{5}} \right) - \left( {1 + \frac{1}{2} + \frac{1}{3} + \frac{1}{4} + \frac{1}{5}} \right) \times \left( {\frac{1}{2} + \frac{1}{3} + \frac{1}{4}} \right)} \right]\)యొక్క విలువ ఎంత?
1
1
2
1/2
3
1/5
4
2