No way to answer. Value of any firearm is based on exact make, model and condition. The Ruger #3 has become somewhat collectible (out of production) and values may start somewhere around $500 and go up. You need a hands on appraisal. Visit a gun shop or gun show.
The value of a Ruger No. 3223 caliper gun depends on its condition. This gun in excellent condition is valued between 489.00 and 569.00 as of 2014.
200-800 USD
100-1000 depending on specifics
The Ruger No. 3 carbine was produced from 1972 to 1987. It is booked at $500 for 100% condition (new in box), $300 at 90%, $250 at 80%, and $200 at 70%.
100-1000 USD
100-550 or so
250-550 USD
50-500 usd
Assume that the starting/seed value is s0 = 0 and the sequence is sn = sn - 1 + 3. Substitute the value of n for each nth term to get: s1 = 3 s2 = 6 s3 = 9 s4 = 12 s5 = 15
Assuming that it is in excellent condition in the range of $400 to $450.
Make, model, condition. We need all 3 factors.
100-1000 USD depending on condition, box, accessories, manual, etc..