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9. Find the sum of first 20 terms of the AP 5, 13, 21, |
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Answer» ong>Answer: 157 Step-by-step EXPLANATION: a= 5 , d= 8 , n= 20 an = a + (n-1)d a20 = 5 + (20-1)8 = 5 + (19)8 = 5 + 152 = 157 |
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