Any account of Dirac's bra-ket vectors depends critically on your understanding of vector spaces. Unfortunately, we have no idea as to how familiar you are with such concepts and cannot take on the task of educating you in vector spaces. I suggest you look at the Wikipedia article at https://en.wikipedia.org/wiki/Bra%E2%80%93ket_notation
Two vectors: no. Three vectors: yes.
Two vectors, no; three vectors yes.
Yes.
Assuming you want non-zero vectors, two opposing vectors will give a resultant of zero.
In vector addition, the sum of two (or more) vectors will give a resultant vector. There are a number of sites that will help you with tutorials. A link to one can be found below.
Two vectors: no. Three vectors: yes.
Two vectors: no. Three vectors: yes.
Two vectors, no; three vectors yes.
Yes.
vectors help in determining the direction . they give the magnitude of the number as well as the direction of the quantity
Assuming you want non-zero vectors, two opposing vectors will give a resultant of zero.
a resultant vector
Two vectors with unequal magnitudes can't add to zero, but three or more can.
No.
In vector addition, the sum of two (or more) vectors will give a resultant vector. There are a number of sites that will help you with tutorials. A link to one can be found below.
Yes, put the three vectors in a plane, with a separation of 120 degrees between each vector and each of the other vectors.
No.