Mario, I have forwarded this posting to the listing agent of 97 Youngtown Road in New Hampshire so he can make necessary changes, if needed. I looked this home up on Realtor.com since Realtor.com pulls information directly from the MLS and since Trulia pulls information from various sources sometimes the details are different. However, on Realtor.com it also states 4 bedrooms, but I was able to get the Listing agent's contact information.
You can also let your buyer's agent know about the discrepancy and they can report it to the local MLS. Sometimes data entry mistakes happen, and it is in everyone's best interest for those errors to be reported so the listing details are accurate.