How many terms of the AP:9,17,25,... must be taken to give a sum of 636?
and the sum is 400. Find the number
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Answer:
as we know in ap sn = 636 and d = 17-9=8
therefore 636= 8 + (n-1)d
636=8+8n -8
636/8=n
n=79.5
Step-by-step explanation:
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