If a(a -1) = 20 and b(b - 1) = 20, where a ≠ b, then a + b =
Choices:
A) −48 B) −1 C) 2 D) 46 E) 67
i.e. if a = 5 then b = -4   or if a = -4 then b = 5   −1ut in each case a+b = -5+4 = -1   Answer: option −1
<result>B</result>
If a(a -1) = 20 and b(b - 1) = 20, where a ≠ b, then a + b =