How many degrees are between the hands of a clock at 3 : 30 ?
A
75°
B
90°
C
105°
D
70°
Correct Answer: 75°
a + b + c = 0 Or, a + b = - c Or, (a + b)3 = - c3 Or, a3 + b3 + 3ab(a + b) = - c3 Or, a3 + b3 - 3abc = - c3 So, a3 + b3 + c3 = 3abc