Question

Help please !!!!!!!!! I just want to be sure if I m correct or not.



Given the sequence of numbers: 5, 6, 8, 11, 15, 20, 26, 33, 41,… Explain whether or not this sequence can be considered a function.


These number are not a function because these number does not have input and output relationship, since numbers does not have input and output relationship, it cannot be a function. Although there is a x value repeat itself such as (5,15) (5,20). That's why, It cannot be a function

Answer 1

@amistre64 can you check this one?

Answer 2

@wolfe8 can you check my answer?

Answer 3

@jigglypuff314

Answer 4

@whpalmer4

Answer 5

@hartnn can you check this?

Answer 6

i would say input variable(x) could be assumed and the sequence for output variable y is given.
based on which we can form a function
y= f(x) = 5+ x(x-1)/2
which is indeed a function

Answer 7

how will able to know if those are function or not? Please help me

Answer 8

i'll tell u a case when we can say its not a function,
let we have pairs of numbers as (1,2),(1,4),(2,4)
in this case , if you observe, the x value of '1' maps to 2 different y values.
only in such cases, those pairs does not form a function, and they are just a relation.

in our question, i 'assumed' that x values do not repeat, which makes the pairs as a function.

even i am in some doubt whether to assume that and call this sequence a function or to not assume and call it 'not a function'
you might wanna take a second opinion.

Answer 9

if we don't assume anything, then you are absolutely correct, including the reason you gave.

Answer 10

okay (5,15) (5,20) ( 11, 41) (6,33). you mean like this?

Answer 11

yes, thats would not be a function.
as f(5) cannot be determined whether it will be 15 or 20

Answer 12

okay then I am right way I stated but I do have to showed to like this?

Answer 13

the input sequence is not given at all ?

Answer 14

I mean, I do have to show it like this in order pair way I showed you . right?

Answer 15

if you are answering that its not a function, then yes, you can show the example in ordered pairs

Answer 16

okay, can you tell me if my answer is absolutely correct or there still some error?

Answer 17

the question is itself unclear to me, they should have given you input sequence.
But, given that question, i would say yes, your reasoning is correct.

Answer 18

okay thanks so much for helping !!!!!!!!! Sorry I kept you here quite long :(

Answer 19

no problem :)

Answer 20

thanks a lot again for your precious time :) you are too cool and amazing more than Goku :)