Answer:
step 3
Step-by-step explanation:
in step 3, he wrote that the sum of 171+ 52.45-18.50 was 241.95 when it is 199.95
Answer:
See below.
Step-by-step explanation:
1)
So we have:

This can be interpreted as:
"There exists a natural number <em>x</em> and an integer <em>y</em> such that x² is equal to y²."
2)
So we want even numbers are in the set of integers.

This is interpreted as:
"The set of even numbers (2n such that n is an integer) is in the set of integers"
Probability of lock code with all even digits = (4/9) ^ 4 = 256/6561 = 0.039
So probabiilty of lock without all even digits = 1 - 0.039 = 0..961.
Those are just repeating equivalent decimals