how many terms of the ap : 9,17,25,.. must be taken to give a sum of 636
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Answered by
6
Answer:
a=9 , d=17-9=8.
A/Q,
Sn => 2a + (n-1) d = 636
=> 2*9 + (n-1) 8 = 636
=> 18 + 8n - 8 = 636
=> 8n + 10 = 636
=> 8n = 636 - 10
=> 8n = 625
=> n = 625 / 8
=> n = 78...
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1
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