Math, asked by khanhafsa580, 10 months ago

Ans diz 10 q plzzz.....with explaination

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Answered by Rajkumar72699

0

Answer:

Step-by-step explanation:

Sn=n/2(a+an)

399=n/2(1+20)

399x2=21n

798=21n

n=798/21=38

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