Mark and jack work as clerks at the new bank of north america. they plan to rob the bank and manage to get its floor plans. they study the security arrangements and movements of the security personnel of the bank. they even get weapons in case force is required to rob the bank. the police, however, get information about the plan and arrest mark and jack before the robbery occurs. what crime mark and jack have committed?

"They" (and any subsequent words) was ignored because we limit queries to 32 words.

Explanation:

What crime Mark and Jack have committed? Criminal conspiracy.

Explanation:

In order to criminal conspiracy exists, there should always be an agreement between two or more people where they plan to commit an unlawful act.

There are no formalities in this agreement, it just takes one person to convince another and start planning all the details.

In this example, Mark and Jack did not get to rob the bank but just for the intention, they are arrested.