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Question Number 116921 by Engr_Jidda last updated on 08/Oct/20

Answered by $@y@m last updated on 08/Oct/20

$$a=2500,d=500$$$$\left(\mathrm{a}\right){\mathrm{S}}_{18}=\frac{18}{2}\{2\times 2500+17\times 500\}$$$$=9\times 13500=1,21,500$$$$\left(\mathrm{b}\right)t_{20}=2500+20\times 500=12500$$

Commented by Engr_Jidda last updated on 08/Oct/20

$$\mathrm{thank}\mathrm{you}\mathrm{sir}$$

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