What is the probability that the position in which the consonants remains unchanged when the letters of "MATH"are re-arranged?

What is the period for which pollen grains remain functional?

The letters of the word "SOCIETY" are placed at random in a row What is the probability that in the random arrangement of the letters of the given word the three vowels come together?

If each element of a second order determinant is either zero or one, what is the probability that the value of the determinant is positive? (Assume that the individual entries of the determinant are chosen independently, each value being assumed with probability 1/2.)

Which is the particle of an atom that has the possibility of changing of position, which can be exchanged when atoms rub against each other collide or chemically react with other atoms?