1+r+r^2+........+r^n=(1+r)(1+r^2)(1+r^4)...

`1+r+r^2+........+r^n=(1+r)(1+r^2)(1+r^4)(1+r^8)` then find `n`

1+r+r^2+........+r^n=(1+r)(1+r^2)(1+r^4)(1+r^8) then find n
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If sum(r=1)^(n)I(r)=2^(n)-1 then sum(r=1)^(n)(1)/(I(r)) is
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If Deltar=|[x,y, z],[2^r,2xx3^r,3xx4^r],[2(2^n-1),3*(3^n-1),4*(4^n-1)]...
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If1+r+r^(2)++r^(n)=(1+r)(1+r)r^(2))(1+r^(4))......(1+r^(128)) then
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The value of lim(n rarr oo)(1*sum(r=1)^(n)(r)+2*sum(r=1)^(n-1)(r)+3sum...
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1+r+r^(2)+.......+r^(n)=(1+r)(1+r^(2))(1+r^(4))(1+r^(8)) then find n
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lim (n rarr oo) (1) / (n ^ (4)) sum (r = 1) ^ (n) r (r + 2) (r + 4) =
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Statement -2: sum(r=0)^(n) (-1)^( r) (""^(n)C(r))/(r+1) = (1)/(n+1) ...
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Prove that : (i) (n!)/(r!)=n(n-1)(n-2)...(r+1) (ii) (n-r+1)*(n!)...
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