Use sigma notation to write the sum. 1. 1/2(1) + 1/2(2) + 1/2(3) + . . .

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Use sigma notation to write the sum.
1. 1/2(1) + 1/2(2) + 1/2(3) + . . . . + 1/2(20)
2. 1/2 + 2/3 + ¾ + . . . . + 9/10
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