7. In an AP, a = -6 and d = 2. Find the sum of its first 20 terms.
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Answer:
The Sum of First 20 terms of an AP is 260.
Step-by-step explanation:
Sn=n/2[2a+(n-1)d]
S20=10[-12+19d]
S20=10[-12+38]
S20=10×26
S20=260
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