Let A = {a, b, c, e, f, g}, B = {b, c, d, f, g, h} and C = {c, d, e, g, h, i}. The value of ((A − B) − (A − C) − (C − B)) is:

If a + b + c = 3, the value of (1 − a)³ + (1 − b)³ + (1 − c)³ − 3(1 − a)(1 − b)(1 − c) is

If a + b = a/b + b/a, then the value of a² + b² is –

If a - b = 4 and ab = 12, what is the value of a² + b²?

If a, b, c, d, e and f satisfy 2a = 3b = 6c = 9d = 12e = 18f, then what is the value of (a + b)/(c + d + e + f)?

If x + (1/y) = 1 and y + (1/z) = 1, then the value of z + (1/x) is