if 2 equations x 2+px+q=0 & x 2+lx+m=0 have one common root,then how many of following 3 statements can be true?1) Common root is (pm-ql)/(q-m)2)Common root is ( q-m )/(l-p)3) Square of common root is (pm-ql)/(l-p)

1) 0
2) 1
3) 2
4) 3