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Question-104752




Question Number 104752 by mohammad17 last updated on 23/Jul/20
Commented by qwertyu last updated on 23/Jul/20
S_n =((51+21)/2) ∙ 31 = 1116
$${S}_{{n}} =\frac{\mathrm{51}+\mathrm{21}}{\mathrm{2}}\:\centerdot\:\mathrm{31}\:=\:\mathrm{1116} \\ $$
Answered by Dwaipayan Shikari last updated on 23/Jul/20
S=21+22+.... 31 terms  S=((31)/2)(2.21+30)=31.36=1116
$${S}=\mathrm{21}+\mathrm{22}+….\:\mathrm{31}\:{terms} \\ $$$${S}=\frac{\mathrm{31}}{\mathrm{2}}\left(\mathrm{2}.\mathrm{21}+\mathrm{30}\right)=\mathrm{31}.\mathrm{36}=\mathrm{1116} \\ $$
Commented by mohammad17 last updated on 23/Jul/20
thank you sir
$${thank}\:{you}\:{sir} \\ $$

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