"Nivelazo",
Fernando Sánchez Dragó
has defined
the problem that has brought Twitter upside down.
"I agree with Girauta: the answer is 1. That is, at least, what they taught me at school. The rest are mandangas. It fills me with astonishment that so many tweeters give other answers and, especially, 5."
But what is the writer talking about?
The problem in question was published on Saturday by Twitter user Gracia Muñoz Aguirre, and warned: "98% fail in this exercise."
1 + 1 + 1 + 1 + 1x0 + 1
And the possible answers are:
a) 1
b) 5
c) 6
Both
Juan Carlos Girauta
and Sánchez Dragó have opted for
option a) 1
, and yet there are many users more versed in mathematics than they, who are against them and opt for 5. Why?
For Girauta or Sánchez Dragó, the calculation starts from adding the first five ones, multiplying them by zero (result: zero) and adding one.
Hence they ensure that the account gives one.
However, they do not count on that mathematics has its hierarchy, and multiplication passes over addition.
Thus, for the result to be effectively one, the problem would have to have looked like this:
(1 + 1 + 1 + 1 + 1) x 0 + 1
According to the criteria of The Trust Project
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