Asked by Sora
                Write each series in summation notation:
*this is the only one that i cant solve
-2+4+(-6)+8+(-10)+12
Please help! :(
            
        *this is the only one that i cant solve
-2+4+(-6)+8+(-10)+12
Please help! :(
Answers
                    Answered by
            Reiny
            
    Had they all been positive, then it would be 
∑ (2n) from n=1 to 6
but they alternate + - , so you need a multiplier that flip-flops between ±
how about (-1)^n, if n is odd you get a negative, if n = even you get a positive, so ....
∑ (2n)(-1)^n from n=1 to 6
    
∑ (2n) from n=1 to 6
but they alternate + - , so you need a multiplier that flip-flops between ±
how about (-1)^n, if n is odd you get a negative, if n = even you get a positive, so ....
∑ (2n)(-1)^n from n=1 to 6
                    Answered by
            Sora
            
    Thanksssss 
    
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