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(9-9)/(9+9) + (10-10)/(10+10) +(11-11)/(...

` (9-9)/(9+9) + (10-10)/(10+10) +(11-11)/(11+11) +...........(99-99)/(99+99) `=

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Prove that: (1)/(9!)+(1)/(10!)+(1)/(11!)=(122)/(11!)

If (10)^9 + 2(11)^1 (10)^8 + 3(11)^2 (10)^7+...........+10 (11)^9= k (10)^9 , then k is equal to :

If (10)^9 + 2(11)^1 (10)^8 + 3(11)^2 (10)^7+...........+10 (11)^9= k (10)^9 , then k is equal to :

99999div99div9=?

(9)/(10)+(3)/(11)+(7)/(15)=?

If (10)^(9)+2(11)^(1)(10)^(8)+3(11)^(2)(10)^(7)+..........+10(11)^(9)=k(10)^(9), then k is equal to:

If (1)/(9!)+(1)/(10!)=(x)/(11!) then x=

If (10)^(9) + 2(11)^(1) (10)^(8) + 3(11)^(2) (10)^(7) + …. + 10(11)^(9) = k(10)^(9) , then k is equal to

If (10)^(9) + 2 (11)^(1) (10)^(8) + 3(11)^(2) ( 10)^(7) + …. =k ( 10)^(9) , then k is equal to

If (10)^9+2(11)^2(10)^7 +….+10 (11)^9 = k(10)^9