Question

the sum of first 20terms of an ap 1,4,7,10 is​

Answer 1

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$Let a be the first term and d be the common difference of the given A.P.</p><p></p><p></p><p>Then, we have a=1 and d=3</p><p></p><p></p><p>we have to find sum of 20 terms of the given A.P.</p><p></p><p></p><p>Putting a=1,d=3,n=20 in Sn=2n{2a+(n−1)d}, we get</p><p></p><p></p><p>S20=220{2×1+(20−1)×3}=10×59=590</p><p></p><p>$

Answer 2

S = 590

Step-by-step explanation:

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