Question: If Sn = A B C D n 2r + 1 14 +21 +1 220 221 420 441 439 221 440 441 then S20

If Sn = A B C D n 2r + 1 14

 

If Sn = A B C D n 2r + 1 14 +21 +1 220 221 420 441 439 221 440 441 then S20 =

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