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Department of Mathematics and Information Technology

Math Challenges - 2023 每月問題 (1月份問題)

Date:2023-01-28
Time:18:00:00

小學組 (Primary Section)

如果從2至11這十個數中取去其中一對數(即兩個數),使餘下八個數之和是一個質數,這樣的數有幾多對?

If a pair of numbers (two numbers) are taken away from the ten numbers 2,3,…,11, the sum of the remaining eight numbers is a prime number. How many such pairs of numbers are there?

 

初中組 (Junior Secondary Section)

N 是一個小於1000的正整數,它有十個因數,其中兩個是4和62,設這十個因數之和是 S 。求  。

N  is a positive integer less than 1000 and has exactly ten factors. Two of these factors are 4 and 62. Let the sum of these ten factors be S . Find .

 

高中組 (Senior Secondary Section)

二人輪流擲三顆骰子,誰先擲出總點數是平方數者勝。這個遊戲對先擲者還是後擲者有利?

Two persons roll three dice in turn. Whoever gets a sum that is a square number will be the winner. Who will this game favour, the person rolling first or second?

 

参加辦法

参加同學請把以下資料載於不多於兩頁A4紙的 PDF格式(不接受其他格式)的附件,於本月28日下午6時前電郵至monthlyproblems@eduhk.hk

載於附件的資料包括:

  • 完整題解和答案
  • 以中、英文書寫的參加者姓名、年級、就讀學校名稱 和學校地址
  • 聲明:「這題解是本人研習的成果。」

高中組不接受手寫題解,只接受電腦打印題解。

 

Participation Method

Put the following information in a PDF (other formats not accepted) file of not more than two A4 pages. Send the file as an email attachment to monthlyproblems@eduhk.hk by 6 pm on 28 Jan.

Information required:

  • Solution to the problem
  • Student name, year, school name, and school address (in both Chinese and English)
  • Declaration: “This solution is my own work.”

Solutions to the senior secondary problem should be typewritten. Handwritten solutions to the senior secondary problem will not be accepted.