How to get the all possible combinations in an array.

Question

There is array1 with 5 element and we have to select 3 Out of 5 elements from array1 such that all possible combination from array1 is in array 2(no repetition of elements).
Eg i/p array1={1, 2, 3, 4}
o/p array2={{1, 2, 3},{2, 3, 4}{3, 4, 1}{4, 1, 2}}

Answer 1

https://code.sololearn.com/cviPxpwf2te0/?ref=app
https://code.sololearn.com/cK8udil2RGsu/?ref=app
https://code.sololearn.com/cVuDQWAA0JiZ/?ref=app