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OpenStudy (anonymous):
please help.....what is the next number if the series... -3, 9, -27, 81
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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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