Permutation Combination vs Pipe Offset & Cut Length

"Permutation Combination Calculator" is an application that makes it easy to perform calculations for permutations and combinations commonly used in mathematics and statistics. By using this app, even those who are not good at mathematical calculations can easily perform calculations. The app is equipped with functions for performing permutation and combinatorial calculations. In permutation calculations, you can find the number of cases where r elements are selected from n elements. Combinatorial calculations, on the other hand, allow you to find the number of cases where r elements are selected from n elements, disregarding the order. In web-based examinations with strict time limits, reducing the time spent on calculation questions can free up time to answer other questions. By allocating your time appropriately and using the "Permutation Combination Calculator", you can take the web-based examinations efficiently and accurately.

Rolling offsets, solved before you cut. Pick the fitting and the size, type what you measured, and you get the cut length with the takeoff (Z in the standards) already subtracted from both ends. Mark the pipe and cut it. ■ If it will not go together, you hear it first A positive number does not mean it can be assembled. When the socket depths would overlap, the app finds it before you cut and shows what does fit — a fitting with a smaller angle, or one size down. ■ Offsets that move in two directions For a rolling offset, the app separates true offset, run, travel (center to center) and the roll angle. It works at 22.5° and 11.25° as well as 45°, and when the run you have is fixed, it can solve for the angle instead. ■ Every number carries its source Welded fittings use the bend radius R = 38.1 x nominal size (inch) with ASME B16.9 for the 45° center-to-end; PVC DWV uses the published fitting dimensions. Japanese standards (JIS K 6739 / K 6743 / K 6777, JIS B 2301) are there when you switch regions. Tap the info button next to the answer to read where a number came from. ■ Fittings that are not in the table, you measure and add Measure a fitting once and register it, and every answer after that matches the part in your hand. Thread engagement can be adjusted per size, one thread at a time. ■ Keep it per job, hand it over on paper Add an answer to a job and it becomes a table: piece number, cut length, fitting, roll angle. Export it as a PDF or CSV. Register a fitting and the numbers on the paper are recomputed too. ■ Works with no connection Everything is computed on the device. Job records stay on this device only — they are not stored in iCloud, so they cannot move to a new phone. What leaves the device is your support messages, plus anonymous usage statistics and crash diagnostics (Firebase Analytics / Crashlytics). ■ About pricing Cut length for a straight run between two fittings, the 45° offset in one plane, the 78 bundled fittings and the welded formula are free, always. Rolling offsets, 22.5° and 11.25°, solving for the angle, your own measured fittings and thread engagement, and job cut lists (PDF/CSV) are Pro. There is a one-time purchase, or monthly and yearly plans. ■ Units and standards Switch between inch (ASME, North America) and mm (JIS, Japan). In North America the fittings become ASME B16.9 (welded) and PVC DWV, and the 45° center-to-end is read from the published table. What the app shows is a guide for installation. The final call belongs to the job's own standards and a licensed fitter. The app does not reproduce standards documents or manufacturer catalogues — it cites the number and name of the standard, the maker and the revision, and computes dimensions from published values and formulas. Monthly and yearly plans renew automatically. You can cancel in Settings > your name > Subscriptions on your iPhone. The one-time purchase does not renew. Terms of Use: https://rainbowtree.work/app/terms Privacy Policy: https://rainbowtree.work/privacy/haikan-kirisunpo.html