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5+9+13+17 sum of the 20terms of this AP is |
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Answer» ong>Step-by-step EXPLANATION: Given: Sum of an AP=> 5+9+13+17+....... Here, a=5 d=9-5=4. N=20. To FIND: S20=? Formula of sum of n terms: Sn=n/2(2a+(n-1)×d) => S20=20/2(2×5+(20-1)×4) => 10(10+19×4) => 10(76+10) => 86×10 => 860. |
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