## On the Subject of Caesar’s Maths

You thought maths was hard enough? Well now it’s encrypted too.

- This module will display three LEDs and a maths question, encrypted using a Caesar Shift cipher.
- Use the formula below to determine the shift key.
- Decipher the question using the concise table on the next page.
- Select the button with the correct answer to the problem.
- If the answer is a decimal, round down to the nearest integer.
- Choosing an incorrect answer will cause a strike and reset the module.

### Caesar Shift key formula:

**((6a * b ^{c}) - d) mod 26**

a = sum of digits in the serial number

b = number of batteries on the bomb + 3

c = number of green LEDs on the module

d = number of red LEDs on the module