Heriberto has only $5 and $2 notes with him. If the total number of notes that he has is 10 and the amount of money with him is $ 26, then the number of $5 and $2 notes are, respectively

From among a group of 6 men, 3 women and 7 children, 4 individuals are selected randomly. What is the probability that exactly 3 among the chosen are children?

In a seminar, the number of participants in German, English and French are 96, 80 and 152 respectively. Find the numbers of rooms required to house them if in each room, the same number of participants are to be accommodated and all of them must belong to the same language.