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Question Number 57621 by Gulay last updated on 08/Apr/19

Commented by Gulay last updated on 08/Apr/19

$$\mathrm{sir}\mathrm{help}\mathrm{me}\mathrm{plz}$$

Answered by tanmay.chaudhury50@gmail.com last updated on 08/Apr/19

$$S_9=\frac{9}{2}[2a+(9-1)d]$$$$72=\frac{9}{2}\times 2[a+4d]$$$$$$$$\frac{72}{9}=T_5\to T_5=8$$$$T_n=a+(n-1)d$$

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