Math

What is the sum of the first 40 consecutive odd numbers?

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  1. 1 + 3 + 5 +........2n-1....

    1st term = 1
    40th term = 2*40-1 = 79
    arith metic progression

    s = n/2(a1+an)
    = 40/2(1+79) = 1600

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