Each student at State college has a student I. d number consisting of eight digits ( the first digit is nonzero, and digits may be repeated) followed by two of the letters A, B,C, D,and E (letters may not be repeated). How many different student numbers are possible

1,800,000,000 ways

Explanation:

Given

Required

Number of ways of selection

From the 8 digits; the first must be nonzero (i.e. any of 1 - 9).

There are 9 ways of selecting this:

The other 7 digits could be any of the 10 digits and there may be repetition.

Each of the digits can be selected in 10 ways. So, the number of ways of selecting the 7 digits is:

For the alphabets:

The first can be selected from the letters while the second can be selected from the remaining

So, the number of ways the alphabets can be selected is:

Total number of selection is:

to prevent people from getting the ebola virus, countries around the world paid to doctors develop a new vaccine. now that the vaccine has been made, doctors will need to experiment on a large number of people to find out if it works safely.

what is the greatest limitation that scientists are dealing with as they try to figure out how to experiment with the ebola vaccine?

meditation is a practice of sitting still and quiet for minutes or even hours. it has been practiced for thousands of years and is even a part of religious practices for some people. carefully controlled, repeated measurements of brain activity have shown that meditation does increase certain chemicals in the brain and even grows the part of the brain that people connect with their current surroundings and activities.

are claims about the effects of meditation most likely scientific or pseudoscientific?

not pseudoscientific, because people have made claims about it but scientific observations have not been made