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Missing numbers in sequences.

Questions (2)

(4,57)(3,20)(2,1)(5,?)What is the missing number?
1. 4 answers
2. asked by Nan
3. 602 views
5-24,3-40,8-15, 12-...?What is the missing number?
1. 1 answer
2. asked by Namith
3. 1,003 views