Assuming you have a cartridge with PS 81 on the back- all I can say is that it is a military cartridge, made in 1981. The PS code was used by 4 different countries, so can't really tell what cartridge that is.
p=1
7/8 P(all heads) = (1/2)*(1/2)*(1/2)=(1/8). P(at least one tails) = 1-P(all heads) = 7/8. Another (more time-consuming) way to get the same result: P(all tails) = (1/2)^3=1/8 P(exactly two tails) = 3*(1/2)^3=3/8 P(exactly one tails) = 3*(1/2)^3=3/8 P(at least one tail) = P(all tails) + P(exactly two tails) + P(exactly one tails) = 7/8
24 - 2001 Day 8 400 p-m--500 p-m- 8-1 is rated/received certificates of: Netherlands:12 USA:TV-14
13. Come on this one is easy. HAHAHA :P
The equation is as follows: p - 5/8 (1/4 + p). This equation expands to (1/4)p + p^2 - 5/32 - (5/8)p, which simplifies to p^2 - (3/8)p - 5/32. Now either solve for p using the quadratic formula or solve by factoring.
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That doesn't factor neatly. Applying the quadratic formula, we find two real solutions: (7 plus or minus the square root of 145) divided by 16. p = 1.1900996611745185 p = -0.3150996611745185
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