SAT the first term of a certain sequence is -2 and the secon

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SAT
the first term of a certain sequence is -2 and the second term is -4.Every term after the second term is obtained by dividing the sum of the previous two terms by 2.For example,the third term of the sequence is (-4)+(-2)\/2=-3.What is the sixth term of

NO.4：(-4+-3）/2=-3.5
NO.5:(-3+-3.5)/2=-3.25
NO.6:（-3.25+-3.5）=3.375

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