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    slavo70's Avatar
    slavo70 Posts: 1, Reputation: 1
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    #1

    May 6, 2009, 10:06 PM
    Next number in this series.
    What is the 6th number in this sequence?

    1, 2, 6, 42, 1806,?

    Thank you!
    Zazonker's Avatar
    Zazonker Posts: 126, Reputation: 19
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    #2

    May 7, 2009, 01:03 AM

    Well, you didn't ask for the formula, so just looking at the sequence:
    1,2 can start a lot of different sequences
    6 coming next - hmm 6 is 2*3 which is the previous number (2) times that number +1 (2+1=3)
    So if we try that for the next number we have 6 * 6+1 = 6 * 7 = 42
    and the next:
    42 * 43 = 1806
    so, for the next number
    1806 * 1807 = 3263442 which I would say is your answer.
    To go back and check the initial 2 numbers
    1 * 1+1 = 2
    so the answer should be valid since it complies with all available information.

    From this, can you write the expression for the series?
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