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some reds are trees.
all tree are black.
no tree is carbon
All carbon are air
some carbon are oxygen.
no oxygen is ozone.
Con:
All red being ozone is a possibility.

does this conclusion follow statements

123!  can be written in the form of 4n. how???

number of non-negative integral solutions of

a+b+c+d<=15 ?

any method to know prime numbers quickly

venn diagram questions

For a given (n,m,k)..

Using values in the range (0..k), how many different m-combos can be made which sum to n?

For example, if (n,m,k) = (3,3,2) there are 7 possible combinations. For (5,4,2) there seem to be 16.

I've been trying to approach this like the binomial formula, stars and bars sort of deal but the k-constraint is puzzling me and I'm not entirely sure of what to do.

give questions for ib acio

Where I get current affairs as in the form of audio files in English?if you know please tell me..

How I do spotting error 

how to solve inequality problems