Fine the number which will come next in the line 39,33,27,21,15?
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Answer:9
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This number decrease at the rate of 6 after one number
39(-6)=33(-6)=27(-6)=15(-6)=9(-6).........
this will go on to negative number also
like......
.......(3(-6)-)=(-3(-6))=(-9(-6))........
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