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25 September, 02:15

Find the sum of the first 70 terms of the sequence - 6, - 3, 0, 3, 6, ...

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  1. 25 September, 02:20
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    Hello:

    -3 - (-6) = 0 - (-3) = 3-0=6-3=3 (arhtmitic sequence r = 3)

    Un = U1 + (n-1) r

    U70 = - 6 + (70-1) (3) = 201

    sum = n/2 (U1 + U70)

    sum = 70/2 (-6+201) = 6825
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