In an A.P., a = -6 and d = 2. Find the sum of its first 20 terms.
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Answered by
1
Answer:
sum s = (20/2)[2×(-6) +(20-1) 2]
= 10[-12+38]
= 10×26
= 260 answer
Answered by
2
Answer:
nl2(2a+(n-1)d
20/2(2×-6+(20-1)2
10(-12+38)
10(26)
260
the sum of first 20 terms is 260
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