If the 5th terms of an AP are -4 and -18 respectively find the sum of first 20 terms of the AP
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Answer:
Correct answer is 1150
Step-by-step explanation:
a+4d=30
a+11d=65
⇒d=5,a=10
∴ sum of 20 items
220(2(10)+(20−1)5)
10(20+95)
1150
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