What Comes Next in the Sequence: If 16 = 62; Then 21 = ?

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Look at the given equations and guess what comes next in the sequence; 

16 = 62

55 = 56

28 = 83

21= ?

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Answer:


The equations follows this sequence;

xy = y,(x+1)

So;

16 would be 6 ,(1+1) =  62

Similarly;

55 = 5,(5+1) = 56

28 = 8, (2+1) = 83

Therefore we can find ?

21 = 1,(2+1) = 13

Answer = 13

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