we can use this formula S = 1/2(2a1 + d(n-1))nS = 1/2(2.1 + 10(10-1))10 = 5(2 + 90) = 5.92 = 460
Aptitude
Topic: Progressions
Find the sum of the first 10 numbers of this arithmetic series: 1, 11, 21, 31...
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Find the sum of the first 10 numbers of this arithmetic series: 1, 11, 21, 31...
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