For a group of 7 people, find the probability that all 4 seasons (winter, spring, summer, fall) occur at least once each among their birthdays, assuming that all seasons are equally likely

Let be the event that there are no birthdays in the season. The probability that all seasons occur at least once is

Note that

Using the inclusion-exclusion principle and the symmetry of the seasons,

Now find:

Thus,

The probability that all 4 seasons occur at least once is

0.51.

no this is a nonlinear negative

the rocket cannot penetrate the ground, in a contextual sense, therefore the roots of this equation should be the domain of this function. i'll let you find the roots of this quadratic equation (hint: use the quadratic formula:  

1- c

2-a

step-by-step explanation:

mark brainliest!