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  1. The value of
    1
    		 +
    1
    		 +
    1
    		 is
    (p − n)(n − q)(n − q)(q − p)(q − p)(p − n)
    1. 1
    2. 0
    3. p + q + n
    4. 2n
      p + q
Correct Option: B

1
 +
1
 +
1
(p − n)(n − q)(n − q)(q − p)(q − p)(p − n)

=
(q − p) + (p − n) + (n − q)
(p − n)(n − q)(q − p)

=
0
 = 0
(p − n)(n − q)(q − p)


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