# If the equations x² – px + q = 0 and x² + qx – p = 0 have a common root :

If the equations x² – px + q = 0 and x² + qx – p = 0 have a common root, then which one of the following is correct?

(a) p – q = 0

(b) p + q – 2 = 0

(c) p + q – 1 = 0

(d) p – q – 1 = 0