Aresearcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetical order. what is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different code? a. 4
b. 5
c. 6
d. 7
e. 8

B. 5

Step-by-step explanation:

The code can either be Single letters or 2 letter in alphabetical order

single letter coder are

A

B

C

D

The two letter code are

AB

AC

AD

BA

BC

BD

CD

That is, a total possibility of 10 code which means 4 is not going to work

When E is added then we have AE, BE and the rest . The possibility will be more than 12 so if we have 5 letter then we will have more than enough which means 5 is the answer

110698.56 square miles

step-by-step explanation:

multiply 3.8 by 102

387.6

multiply 2.8 by 102

285.6

multiply those two to get