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27 July, 19:50

What is the sum of the arithmetic series of odd numbers below 1+3+5 + ... + 27

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  1. 27 July, 19:53
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    196

    Step-by-step explanation:

    1+2+3+4 + ... + 25+26+27 = (1+27) + (3+25) + (5+23) + (7+21) + (9+19) + (11+17) + (13+15)

    = 28 x 7 = 196

    It's like area of trapezoid of bases: 1, 27 and height of 14
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