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Math Help - series

  1. #1
    rcs
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    Senior Member rcs's Avatar
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    series

    4 , 16 , 8 , 40 , 20 , 120 , 60 , 420 , _______

    can anybody know on the next number of the blank? because i dont get the pattern ... please help.

    thanks guys.
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  2. #2
    Member anonimnystefy's Avatar
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    Re: series

    the pattern:
    multiply by 4
    divide by 2
    multiply by 5
    divide by 2
    multiply by 6
    divide by 2
    multiply by 7
    divide by 2
    so next you need to multiply by 8 to get 3360.
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  3. #3
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    Re: series

    Hello, rcs!

    \text{Find the next number: }\:4,16,8,40,20,120,60,420,\_\_

    Examine what happens between numbers . . .

    . . \begin{array}{cccccccccccccccccc} 4 && 16 && 8 && 40 && 20 && 120 && 60 && 420 && ? \\ & \times4 && \div2 && \times5 && \div2 && \times 6 && \div2 && \times7 && ? \end{array}


    Got it?
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  4. #4
    rcs
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    Re: series

    thanks soroban.. you are the best!
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