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Question Number 116913 by Engr_Jidda last updated on 07/Oct/20

Answered by Lordose last updated on 07/Oct/20

$$\mathrm{a}=7$$$$7+9\mathrm{d}=2(7+\mathrm{d})$$$$7\mathrm{d}=7$$$$\mathrm{d}=1$$$$\mathrm{a}){\mathrm{u}}_{19}=7+18=25$$$$\mathrm{b}){\mathrm{s}}_{28}=14\left\{41\right\}$$$${\mathrm{s}}_{28}=574$$$$\mathrm{c}){\mathrm{u}}_9-{\mathrm{u}}_6=3\mathrm{d}=3$$

Commented by Engr_Jidda last updated on 08/Oct/20

$$\mathrm{thank}\mathrm{you}\mathrm{very}\mathrm{much}\mathrm{sir}.$$

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