The next number in the series is 57. The pattern is that each term is found by adding the difference between the previous two terms to the current term, so the differences between consecutive terms are

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The next number in the series is 57. The pattern is that each term is found by adding the difference between the previous two terms to the current term, so the differences between consecutive terms are Answer: Saint Anthony's School, Lahore

The differences are 12-5=7 26-12=14 and 57-26=31. This implies an error in the provided pattern or the series itself, as the pattern "adding the difference between the previous two terms to the current term" doesn't fit a standard series. A pattern described as "adding the difference to the previous term to get the current term" would be a normal sequence. However, the pattern seems to be that the difference between consecutive terms is doubling, so the next difference should be 31*2=62