yangtheary

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we have positive number from 1 to 1000. how many time we write number 3?

Find S=1+1/2+1/3+1/4+...+1/n ,n is integers .

Let ABC be a triangle with A(3,0,0),B(0,6,0),C(0,0,4) and let H(x,y,z) be its orthocenter .Find the coordinates of point H ?

solve 30a+75b+110c+85d+255e+160f+15g+12h+120i=8000 over the positive integers

solve 30a+75b+110c+85d+255e+160f+15g+12h+120i=800000 over the positive integers

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