find the sum of first 21 terms of the sequence 3/2,2,5/2,3
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Answer:
136.5
Step-by-step explanation:
1.5+2+2.5+3+3.5+4+4.5+5+5.5+6+6.5+7+7.5+8+8.5+9+9.5+10+10.5+11+11.5=136.5
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