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Mathematics 9 Online
OpenStudy (anonymous):

please help.....what is the next number if the series... -3, 9, -27, 81

OpenStudy (anonymous):

-243

OpenStudy (anonymous):

please explain.....how??....could not get it.... :(

OpenStudy (anonymous):

-3= -(3^1) 9=+(3^2) -27= -(3^3) its actually a series of \[(-1)^{n}\times3^{n}\]

OpenStudy (anonymous):

hmmm....it's easy now....thanks a lot.... :)

OpenStudy (anonymous):

u r welcome

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