જો a = 5, b = 4, c = 8 હોય, તો (a^3 + b^3 + c^3 - 3abc)/(ab + bc + ca - a^2 - b^2 - c^2) નું મૂલ્ય શોધો. A. 15 B. 17 C. -17 D. -15

a³ + b³ + c³ − 3abc = (a + b + c)(a² + b² + c² − ab − bc − ca), and the denominator is −(a² + b² + c² − ab − bc − ca). So the expression = −(a + b + c) = −(5 + 4 + 8) = −17.