Why in my pc showing correct but not in this
@Sumit, you are probably using a function from a toolbox (e.g. statistics toolbox) that is not available to Cody.
The test suite throws errors where but I get correct answers when I run.
function y = fcn(n,k)
y = size(combntns(1:n,k),1);
Let me import my Statistics Toolbox!
Back to basics 13 - Input variables
Is the input divisible by 3?
convert matrix to single column
Are you in or are you out?
Cull vector elements that contain a specified digit
Flip the bit
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