What is the probability that a coin will be odd when tossed fifty times?

The probability is 0.5, which can be considered as follows:

Throw 49 times in front, the probability of odd direction is equivalent to even direction in the pattern (because the number thrown is odd, one is odd and the other must be even), and the probability of even direction in the pattern is equal to the probability of even direction (a coin has only two sides, so there is no essential difference between the two sides, so it is equal).

Therefore, it can be deduced that the probability of the first 49 odd and even directions is 0.5.

On the 50th throw, there is a probability graph of 0.5 up and a probability graph of 0.5 down.

If this number is upward, it will be even times with the previous number, forming odd times upward, and the probability is: 0.5×0.5=0.25.

If the number goes down, the number of times the previous number goes up is odd, and the probability is: 0.5×0.5=0.25.

Both of these situations can happen, so the total probability is: 0.25+0.25 = 0.5.