Three Molecules Of Type A ,three Of Type B, Three Of Type Ck And Three Of Type D Are To Be Linked Together To Form A Chain Molecule. One Such Chain Molecule Is Abcdabcdabcd, And Another Is Bcddaaabdbcc. (a) How Many Such Chain Molecules Are There? {hints: If The Three A's Were Distinguishable...

A group of 5 boys and 4 girls are to be photographed. How many ways can the photograpg be arranged with the girls in the front row, and the boys in the back row? A club has 10 members. In how many ways can they shoose a committee of 3 members?

In a spreadsheet, how do I get a count total if there are two criteria? For example, in one column I want to count all the "1"'s if, in another column there is a "c".

I found that a circle placed in a rectangle can be shaded in 4 different ways. First, don't shade anything. Second, shading the circle only. Third, shading the rectangle only. Fourth, shading both the circle and rectangle. The question is: Find the number of shadings possible for 2 circles in a...

How long would it take an average person to count to one million if they had 8 hours a day to do the counting.