Not all Blu-Rays use 7.1 audio, but the newer movies are
142/2 = 71/71 = 1 2 x 71 = 142
Using only the digits and the basic operators of arithmetic, 71. If other operators are allowed then 71! = 8.5*10101 approx, or 85 googol is one possible answer.
22 x 71
71 = (8 x 8) + 8 - 8/8
71+38+73+18
It is: 21*71 = 14
32 x 71
22 x 71
Let's not bother Euclid. 71 is a prime number, its only factors are one and itself.The GCF of 24 and 71 is 1.
71
25 x 71 = 224
23 x 71 = 56