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For some 99-digit number k, there exist two different 100-digit numbers n such that the sum of all natural numbers from 1 to n ends in the same 100 digits as the number kn, but is not equal to it. Prove that k-3 is divisible by 5.
(No Solution Yet, 0 Comments) Submitted on 2021-03-03 by Danish Ahmed Khan    

You are handed a following list and asked to select one and to explain your choice:

White, red, pink, green, apple, peach, orange, lemon, kiwi, purple, asparagus, grape.

What, in your opinion, are the interviewers’ expectations?

(No Solution Yet, 2 Comments) Submitted on 2021-03-02 by Ady TZIDON    

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