If a, b, c are in HP, then what is \(\frac{1}{b-a}+\frac{1}{b-c}\) equal to ?
1. \(\frac{2}{b}\)
2. \(\frac{1}{a}+\frac{1}{c}\)
3. \(\frac{1}{2}\left(\frac{1}{a}+\frac{1}{b}+\frac{1}{c}\right)\)
Select the correct answer using the code given below :
1
only 1 and 2
2
only 2
3
only 3
4
1, 2 and 3
5
Question Not Attempted