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yangtheary

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13 years, 181 days
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These are questions asked by yangtheary

From 1 to 1000, how many time we use "5"...

yangtheary 280
combinatorics number-theory
July 21 2014
2 5

From 1 to 1000, how many time we use "5"?

Sequence of integers...

yangtheary 280 Maple
recurrence sequence
February 20 2014
0 1

Let a(1)=916 , a(2)=935 , a(3)=713  , a(4)=845  , a(5)=274  , a(6)=914 ,a(7)=255 . Find formula a(n)= ? ,n=1,2,3,....

Geometry (Circle)...

yangtheary 280
geometry
January 29 2014
2 2

Let OA=OB=OC=R=3,AB=3√2 and BC=2√2 .Find AC?

solve the system of equations...

yangtheary 280 Maple
solve
January 28 2014
1 0

solve the system of equations (10a+3b+4c+d+e=0,11b+2c+2d+3e+f=0,15c+4d+5e+4f+g=0,2a+b-3c+12d-3e+f+g=0,6a-5b+3c-d+17e+f=0,3a+2b-3c+4d+e-16f+2g=0,4a-6b+c+d+3e+19g=0)

Calculus problem (Number theory)...

yangtheary 280
sum
January 26 2014
1 1

 Calculus problem S(n)=1^2+3^2+5^2+...+(2n-1)^2 ?

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