## 1, -6, -9, 0, 45, 198, ?Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.
What's the next number in this series?
1, -6, -9, 0, 45, 198, ? ## Answer675.-6=1*3+(-9) -9=-6*3+9 0=-9*3+27 45=0*3+45 198=45*3+63 -9, 9, 27, 45, 63 form an arithmetic sequence with common difference 18. and therefore, the next number is 675=198*3+81. Hide ## What Next?
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