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5 October, 22:11

Find the tenth term of the sequence.

3, 2, - 1, - 6, - 13, ...

The tenth term is?

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Answers (2)
  1. 6 October, 00:11
    0
    -78

    Step-by-step explanation:

    Odd differences:

    3 - 1 = 2

    2 - 3 = - 1

    -1 - 5 = - 6

    -6 - 7 = - 13

    -13 - 9 = - 22

    -22 - 11 = - 33

    -33 - 13 = - 46

    -46 - 15 = - 61

    -61 - 17 = - 78
  2. 6 October, 00:59
    0
    -78

    Step-by-step explanation:

    We subtract 1, then 3, then 5, then 7

    Then subtract 9,11,13,15,17

    -21 - 11 = - 33

    -33 - 13 = - 46

    -46 - 15 = - 61

    -61 - 17 = - 78

    3, 2, - 1, - 6, - 13, - 22, - 33, - 46, - 61, - 78
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