Periodic Table vs Binomial Coefficient PRO

Chemistry Explorer brings an interactive periodic table, 2D/3D molecules, an equation balancer, and 29 chemistry tools into one focused app for students, teachers, and curious minds. PERIODIC TABLE, PERFECTED • All 118 elements in a clean, color-coded layout • Tap any element for properties, isotopes, spectra, and real-world uses • Instant search by name, symbol, or atomic number MOLECULES IN 2D & 3D • Enter any valid SMILES to generate a structure with RDKit • Search 352 curated molecules by name or formula • Calculate molecular weight, logP, TPSA, and more on device • Rotate and explore structures in interactive 3D OFFLINE MOLECULE DATABASE • Chemistry Pro unlocks all 8,000 included compounds • On iOS 26.4 or later, Pro can download the complete 467,735-compound library through Apple 29 TOOLS FOR CHEMISTRY, 25 OF THEM FREE • Balance equations; calculate molar mass and stoichiometry; explore pH/pOH, buffers, gas laws, kinetics, equilibrium, solutions, and more DESIGNED FOR FOCUS • Chemistry calculations and molecular processing run on device; no account required • English, Français, 简体中文, 繁體中文, 日本語, Español, Deutsch, Português, 한국어, Русский, and Tiếng Việt • Optimized for iPhone and iPad Twenty-five of the twenty-nine tools are free, the reaction predictor and every reference table among them, plus two SMILES builds a day and all 352 curated molecules. Chemistry Pro is available as monthly, yearly, or lifetime access and unlocks the other four tools — buffers, equilibrium, reaction rate, and Arrhenius — along with unlimited SMILES builds and all 8,000 bundled compounds. Paid users of the original app keep Legacy Pro. Daily free advanced-tool choices: 1. Reopening a chosen tool that day is unlimited. Usage and crash reporting are on by default. You can turn them off in Settings. No advertising ID is collected. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

This app provides two kind of calculations. One is the calculation of the binomial coefficient. The other one is the calculation of n factorial. You have to enter n and/or k to calculate the result. Only natural numbers are supported. The solution is shown step by step. All calculations are stored in the history. The final solution can be shared. [ Contents ] - modes for binomial coefficient and n factorial - n and/or k must be entered - results are calculated and shown in detail - the formula behind factorial and every step is shown - history function to save the input - detailed solution - only natural numbers are supported - no ads! [ Usage ] - there are fields for entering values using a special keyboard - press the check mark button at the bottom right to start the calculation - if values are missing, the relevant field is highlighted in yellow - if the values are wrong, the affected field will be highlighted in red - the entries in the history can be deleted or sorted - if you select an entry in the history, it will be automatically loaded for the calculation - the whole history can be deleted by pressing a button - solutions can be shared - n must be greater than or equal k