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Sequences and Series Test - 3

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Sequences and Series Test - 3
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  • Question 1
    1 / -0

    The 20th term of the series 2 × 4 + 4 × 6 + 6 × 8 +... is

    Solution

    here,

    an = 2n(2n + 2)

    a20 = 2(20)(2.20 + 2) = 40(42) = 1680

  • Question 2
    1 / -0

    The next term of the sequence 1, 3, 6, 10, …. Is

    Solution

    In this sequence the nth term is,an = 1 + 2 + 3 +......+n

    so, for n = 5, a5 = 1 + 2 + 3 + 4 + 5 = 15

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