There are 10 students in a class: 7 boys and 3 girls.
If the teacher picks a group of 4 at random, what is the probability that everyone in the group is a boy?

1/6

Step-by-step explanation:

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

good job you smart son of a gun you are smarter that einstein. 7