Q5.If nth term of an AP is given by 15-4n then find the sum of first 10 terms.
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Answer:
,-70
Step-by-step explanation:
verification
sum of 10 terms= A1+A2+A3+A4+A5+A6+A7+A8+ A9+A10
11+7+3-1-5-9-13-17-21-25=-70
hence proved
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