find
Asked by | 3rd Oct, 2008, 07:47: PM
Expert Answer:
Σn=210
n(n+1) /2 = 210
n(n+1) = 420
21 x 20 = 420 so n= 20
Σn2 = n(n+1) (2n+1) / 6 = 420 x 41 / 6 = 2870
Answered by | 11th Oct, 2008, 09:58: PM
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