How to skip some arabic labels in task environment?

Question

I am writing an answer key to a (math) problem set which contains, suppose, 10 problems. To generate a sequence of numbers I am using task environment with global settings \NewTasks[label = {\bf \arabic*.},label-width=4ex]{answers}[\a].

For example, suppose the problem number 5, 6, 7 are 'prove that' type problems. It means that I don't need to show their answers in the answer key. So, I want to generate a sequence from 1 to 4 and then from 8 to 10.

I don't know how to skip these three particular numbers. I am using TexShop 4.58.

My code is

\usepackage{tasks}
\usepackage{amsmath, amsthm, amssymb, amsfonts}
\NewTasks[label = {\bf \arabic*.},label-width=4ex]{answers}[\a]
\begin{document}
\begin{answers}(5)
\a (C)
\a (D)
\a (D)
\a (C)
\a (D)
\a (A)
\a (C)
\a (C)
\a (A)
\a (B)
\end{answers}
\end{document}

It produces

Please tell me what changes should I do to get desired output?

Thanks

Answer 1

You can do \addtocounter{task}{...} where you need it:

\documentclass{article}
\usepackage{tasks}

\NewTasksEnvironment[label=\arabic*.,label-format=\bfseries,label-width=4ex]{answers}[\a]
  
\begin{document}

\begin{answers}(4)
  \a (A)
  \a (C)
  \a (D) \addtocounter{task}{3}
  \a (C)
\end{answers}

\end{document}

If you want to directly type in the number you want to step up to: that can be done with a little bit of simple math:

\newcommand\gototask[1]{\addtocounter{task}{\numexpr#1-\value{task}\relax}}

\documentclass{article}
\usepackage{tasks}

\NewTasksEnvironment[label=\arabic*.,label-format=\bfseries,label-width=4ex]{answers}[\a]

\newcommand\gototask[1]{\addtocounter{task}{\numexpr#1-\value{task}\relax}}

\begin{document}

\begin{answers}(4)
  \a (A)
  \a (C)
  \a (D) \gototask{6}
  \a (C)
\end{answers}

\end{document}

Both examples give

---

BTW: in your log you should be getting

Package tasks Warning: You've tried setting command `\NewTasks ' on line 6.
(tasks)                However, command `\NewTasks ' is deprecated. Please use
(tasks)                command `\NewTasksEnvironment ' instead. Refer to the
(tasks)                manual for details.

Maybe also have a look at Does it matter if I use \textit or \it, \bfseries or \bf, etc.