Quiz Question

Number 209 of a series

What’s the last digit of the following?

171999 + 111999 – 71999

Enter your answer in the comments section below.

Update and Solution

Mike saw through this one early, only his comment was so cryptic I missed it. See below. I didn’t see it until I started working through it, then I thought, “too easy.” Here is how it works.

A is the last digit of 171999. B is the last digit of  111999. C is the last digit of 71999.

It is obvious A = C, so the answer is B. And B is 1.

2 thoughts on “Quiz Question

  1. Pingback: Quiz Question | Skeptical Analysis

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