Find the missing number in the number series 3, 7, 6, 5, 9, 3, 12, 1, 15, ?
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1
Answer:
-1
Step-by-step explanation:
the every alternate number starting from 3 has been added 3, i.e, 3, 6, 9, 12, 15 while every alternate number starting from 7 has been subtracted 2, i.e, 7, 5, 3, 1, -1
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