Math, asked by dhruv123karmokar, 1 year ago

Can someone please help me in this question ????

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Answered by mohitparmar

Sn=n/2(a+l)
120=n/2(-5+45)
n=120*2/40=6

dhruv123karmokar: can you type the formula again please

dhruv123karmokar: i dont understand it

dhruv123karmokar: please

dhruv123karmokar: ok thanks

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