Math, asked by Heeryi, 10 months ago

if a100=100,s100=5050 find n=?
also
a9=73 , s8= 260 find s9

Answers

Answered by TanmayShresht1977

1

Answer:

576

Step-by-step explanation:

77777887769909999+868878676878678+8788887897+8788978888887+777677788+8887789

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