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Sync settings

Choose what your account keeps in step on every device where you are signed in.

  • My tools

    Always synced: the tools on your board, their order and size.

  • The windows open on your start page, including what you typed in them.

  • Every note in the notepad – on the notepad page, on your board and in windows.

  • Every list of website shortcuts – on the shortcuts page, on your board and in windows.

  • Every grid in the cover grid maker – on its page, on your board and in windows.

  • Every list of bookmarked organisations in the OIN lookup – on its page, on your board and in windows.

  • Keeps your pipeline and saved recipes on all your devices. Your files are never synced – only the steps and settings.

Turning something off removes it from your account straight away. Your devices keep their own copy.

Notifications

Tools that can tell you about something new while a Synsi tab is open, even when you are in another tab or app. Choose them for this browser.

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Notifications are blocked for this site. Allow them in your browser’s site settings (the icon left of the address), then switch them on here.

  • Says “New message” while a Synsi tab is open – never who wrote it or what.

Your choice is stored in this browser only. Notifications never show personal content such as a message or a number. They work while a Synsi tab is open; closed tabs get none.

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Combination Calculator (nCr)

Find how many distinct groups of r items can be selected from n when order is irrelevant.

My tools →

Result

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Results are mathematical estimates. Statistical calculations depend on the entered data and assumptions; they do not establish causation or replace expert review.

Runs in your browser – your data never leaves your device Also available via our free API

How to use the Combination Calculator

  1. 1 Enter the numbers or data requested.
  2. 2 Choose the calculation option when available.
  3. 3 Review the result and its assumptions.

Combinations when order does not matter

Use nCr = n! / (r! × (n − r)!). Choosing 3 items from 10 gives 120 groups because rearranging the same group does not create a new selection.

When to use combinations

Choose combinations for groups, teams or draws where the selected members matter but their order does not. If order changes the outcome, use permutations.

Frequently asked questions

What is the combination formula?

nCr = n! / (r! × (n − r)!), where n is the number of available items and r is the number selected.

How are combinations different from permutations?

Combinations ignore order. Permutations count each different order as a distinct arrangement.

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