How many terms of the AP 9,17,25..... musr be taken to give a sum of 636
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Answered by
0
Answer:
given a=9 , d=8 answer n=72
Step-by-step explanation:
Sn=a+(n-1)d
639=9+(n-1)8
639-9=8n-8
630=8n-8
8n=630+8=638
n=638÷8
n=72
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