1.

How many terms of the AP 9,17,25,...must be taken to give a sum of 636

Answer»

636=9*(n-1)17-9
636=9*(n-1)8
636=9*8n-8
636=9-8*8n
636=1*8n
636-1=8n
635=8n
then we will DIVIDE 635 with 8.
n=79.375



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