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Question

If S subscript 1 equals left curly bracket 1 right curly bracket comma S subscript 2 equals left curly bracket 2 comma 4 right curly bracket comma S subscript 3 equals left curly bracket 3 comma 6 comma 9 right curly bracket S subscript 4 equals left curly bracket 4 comma 8 comma 12 comma 16 right curly bracket comma horizontal ellipsis horizontal ellipsis

then sum of the numbers in the set  is

  1. 450
  2. 550
  3. 475
  4. 575

The correct answer is: 550

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If n is even, S subscript n equals 1 squared plus 2.2 squared plus 3 squared plus 2.4 squared plus 5 squared plus 2.6 squared horizontal ellipsis n terms equals fraction numerator n left parenthesis n plus 1 right parenthesis squared over denominator 2 end fraction, if straight n is odd then S subscript n equals

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