All human blooid is one of the four types : o , a, b or ab. the distributions of the types varies a bit with race. if you choose an african american person at random , here is a table of the approcimate probabilities of that person having each of the different blood types.

blood types : o a b ab
0.5 ? 0.2 0.05

using the table of probabilities above , the probability that the person chosen has blood type a is :
0.05
0.25
0.27
0.40
0.65

i'm having a bit of trouble with probability may someone walk me through it , i'm willing to learn!

the answer is 48m^2!

step-by-step explanation:

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for