Verified Answer :

oYOLOo

If you want to know the formula .. 
You just basically think of your number as 'y' where y could be any number you want. multiplying it by 3 means

3*y or 3y 

then substract 1 so 
 (3y) -1 

OR  3y-1
 
Hope this answers your question!


nathan127

The formula for that statement is:

Let, n = number

"   3n-1  " - there are no brackets needed because of PEDMAS

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