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Calculate in head, the sums of the follo...

Calculate in head, the sums of the following' arithmetic sequences.
i) 51+52+53+ ...+70
ii) 1 1/2+ 2 1/2 +…..12 1/2
iii)1/2+1+1 1/2+ 2 +2 1/2+…..+12 1/2

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V PUBLICATION-ARITHMETIC SEQUENCES-Question Bank
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