Brain Teasers
A Prime (Number) Problem
There is a number that fulfills all of the following criteria/rules:
1. It is prime.
2. It is a whole number.
3. It is greater than or equal to 1.
4. If you double it, square it, or add itself to it, you get the same single-digit even number answer for each operation.
What is this number?
1. It is prime.
2. It is a whole number.
3. It is greater than or equal to 1.
4. If you double it, square it, or add itself to it, you get the same single-digit even number answer for each operation.
What is this number?
Hint
The "single-digit even number" mentioned in the 4th criterion/rule is equal to the number of criteria that the "mystery number" fulfills.Answer
2.2 is prime.
2 is a whole number.
2 is greater than 1.
2 x 2 = 4.
2 ^ 2 = 4.
2 + 2 = 4.
4 is a single-digit even number, and is the answer for all the above operations.
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Comments
too easy...
N*N=N^2
N*N=N^N
Therefore, N=2.
N*N=N^N
Therefore, N=2.
Erm... I made a mistake on above comment. It said square. (What was I thinking?) I meant to say:
N*2=N+N
N*N=N+N
Therefore, N=2
N*2=N+N
N*N=N+N
Therefore, N=2
I wasn't planning on making it difficult, just exploiting a little mathematical "quirk".
it wuz pretty easy but it wuz nice to kno (:
easy but nice one!
Doubling a number is the same as adding the number to itself. Therefore, the 4th criterion is redundant.
I'm perfectly aware that the 4th criterion is redundant.
TOOK me a minute but i got it
we took that one in KG lol , just type " the only even prime number "
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