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Best Answer

Use the equation

S/2 = a + ( n - 1)d

Were a = 1

d = 2 (Consecutive odd numbers havie a difference of '2'

n = 90

Substitute

S = 2[(1) + (90 - 1) 2[

S = 2 + 2(89)2

S = 2 + 356

S = 358

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lenpollock

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Q: What is the sum of the first 90 consecutive odd numbers?
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