One dollar cost Long Island teen Alec Fischthal a $100,000 prize.

Fischthal, 16, of North Woodmere, advanced all the way to the final round of the “Jeopardy! Teen Tournament” during the ABC-TV competition. The tournament was taped in advance and finished airing Tuesday night, Nov. 22.

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Fischthal even got the final answer right — “What is the Mayflower Compact?” — but so did his two opponents. One of them, an Alabama teenager, wagered enough money that his grand total inched above Fischthal’s by $1, making him the grand-prize winner.

“That was pretty emotional for a second,” Fischthal said of the day the show taped in April. “For a second I thought I had it, I was trying to do the math in my head.” But, alas, he fell short.

Don’t feel too bad for Fischthal, though. He walked away with the $50,000 second-place prize. “Not so bad, not so bad at all. Definitely not upset about that,” the George W. Hewlett High School senior said the day after the show aired.

“It was such a great experience,” he continued. “We had a watch party last night at school. Tons of kids came; everyone came out to support me.”

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In the quiz game, answers are provided and the contestants are required to furnish the relevant question. Fischthal competed with about 20,000 students ages 14 to 17 nationwide in an online test. About 300 students had an in-person audition, and 15 students were chosen to be featured in this year’s tournament, taped at DAR Constitution Hall in Washington, D.C.