Find sum of first 20 terms in an A.P. 5.6+6.7+7.8+8.9+.....
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5.6+6.7+7.8+8.9+.10+10.11+11.12+12.13+13.14+14.15.+15.16+16.17+17.18+18.19+19.20+20.21
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Solution have to peep in attach file
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