Answer:
D
Step-by-step explanation:
Answer:
A.) 2(1/2×20×50)+2(1/2×20×10)
By using The half-angle formula
cos X/2 = ±√[(1 + cos X)/ 2]
But we have cos x=2/3
= ±√[(1 + 2/3)/ 2]
= ±√[(5/3 )/ 2]
= ±√[(5/5]
=±√1
Therefore answer is ±1
cos A/2 = ±√[(1 + cos A )/ 2]
The probability would be 50 percent because there are 3 gold watches and 3 silver watches.