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Number theory Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

What is the sum of the digits of the integer which is equal to $6666666^2 - 3333333^2$ ?

(A) $27$ (B) $36$ (C) $45$ (D) $54$ (E) $63$

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Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.