`if ab gt 0 " and " 3a + 5b +15 c=0` then which of the following statement is INCORRECT ?

Given a +b+c+d=0 which of the following statement is incorrect

If, a gt b, a gt 0 , and b ne 0 , then which of the following statements is always true ?

Given a+b+c+d = 0 which of the following statement is incorrect

Given a+b+c+d = 0 which of the following statement is incorrect

If ab gt0 , which of the following must be negative ?

Let f (x) be a polynomial function of degree 3 where a lt b lt c and f (a) =f (b) = f(c ). If the graph of f (x) is as shown, which of the following statements are INCORRECT ? (Where c gt|a|)