The Threes Puzzle

“Daddy, I’d like to have the little red bicycle you see in the shop window over there,” Lenny said pointing, as they were taking a walk along the avenue.

“Sure, Lenny,” said daddy, “If you can solve a little puzzle, I’ll buy it for you right away.”

“Yippee, daddy,” said Lenny enthusiastically, jumping up and down, “tell the puzzle to me right away.”

“Take the number 3 and multiply it by itself 999 times. Then tell me the last digit of the resulting number, Lenny?”

“Hmm…,” said Lenny. “Let’s sit down on that park bench so I can figure it out.”

“Ok, Lenny, take your time,” said daddy.

Lenny sat on the bench with daddy for some minutes with a very concentrated look on his face. Then he brightened up and said “I’ve got the answer, daddy.”

As the answer was correct, they went to the bicycle shop and Lenny came out riding the little red bicycle with a big smile on his face.

What would you say is the last digit in the number resulting from multiplying 3 by itself 999 times?

About Ken

Bachelor of Science in Physics, Honors, University of Maryland. Graduate of Danish School of Classical Homeopathy in 1998. Studies over several years at the International Academy of Classical Homeopathy in Alonnisos, Greece with the world-famous homeopath George Vithoulkas (winner of the Right Livelihood Award, the alternative Nobel Prize). Director of Klinik for Klassisk Homøopati in Herlev, Denmark. Director of the Iberian School and Clinic of Classical Homeopathy in Estepona, Costa del Sol, Spain and Gibraltar. Founding member of the Spanish Association of Classical Homeopathy (Asociación Española de Homeopatía Unicista) approved by ECCH (European Council for Classical Homeopathy). Currently director of the International Homeopathic Web Clinic and the Avila Clinic and School of Classical Homeopathy in Caracas, Venezuela. Kjetill Oftedal offers consultations in English, Spanish, Norwegian, Danish, Swedish, German, Dutch and Portuguese.
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