On a single toss of a fair coin, the probability of heads is 0.5 and the probability of tails is 0.5. if you toss a coin twice and get heads on the first toss, are you guaranteed to get tails on the second toss? explain.

Supposing that the coin is unbiased, and that landing on head and tail are exhaustive events.
So, P (first toss resulting in head) = 1/2and P (second toss resulting in a tail) = 1/2.
The two are independent events, necessary probability (their product) is 1/4.
Another way to see it as: 
Possible outcomes: HH, HT, TH and TT, each with equal probability. Hence, ¼The answer is no because all have an equal probability and the possible outcomes for this can be HH or HT.

Yes. there is a constant ratio of number of calories to gram of protein.12/3=24/4=32/8=44/11=4