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by Brian Gladman on September 21, 2018

Sunday Times Teaser 2517 – No Title

by Andrew Skidmore

Published December 19 2010 (link)

Finley is excited about Christmas. At school, he has made a card showing a triangular-shaped Christmas tree with a fairy on top. With this in mind, please decipher XMAS + TREE = FAIRY, where different letters stand consistently for different digits, and where TREE is a triangular number (ie, is the sum of some consecutive integers from 1 upwards).

What number is XMAS?

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