What is the probability of obtaining 3 heads and 1 tail (order irrelevant) on four flips of a fair coin?

1/2 probability of 1 flip

1/2 x 1/2 x 1/2 x 1/2 = 1/16 probability

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x