19 wrestlemanias out of which he won 17..
Triple H has been in 6 Wrestlemania Main Events
No Undertaker is undefeated at wrestlemania and he already beat Triple H at Wrestlemania X7
I think you wrote something wrong there :) There was no match between Triple H and Booker T in WrestleMania 25. Booker T wasn't even there. But Triple H defeated Randy Orton in a very entertaining and long match (about 23 minutes). Booker T left WWE in the fall in 2007, and I don't think he has ever challenged Triple H in any WrestleMania matches.
WRESTLEMANIA 20
triple h
Triple H has 356 wins and 269 losses
Triple h is returning to the wwe before wrestlemania
Triple H
The UnderTaker did lose at WrestleMania.
The undertaker already beat the game triple h
triple h all the way
triple h because at wrestlemania 29 triple h still had his carreer