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Anni [7]
2 years ago
13

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

Mathematics
1 answer:
AnnZ [28]2 years ago
6 0

Answer:

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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