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Let Sk=1+2+3+⋯+kk for k∈N. If S21+S22+⋯+S219=A4, then the value of A is |
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Answer» Let Sk=1+2+3+⋯+kk for k∈N. If S21+S22+⋯+S219=A4, then the value of A is |
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