Digits (0,1,2,3,4,5,6) से repetition बिना (4)-digit numbers बनाने हैं जो (5) से divisible हों। सही count expression कौन-सा है?
Using digits (0,1,2,3,4,5,6) without repetition, (4)-digit numbers divisible by (5) are formed. Which count expression is correct?
Explanation opens after your attempt
A. \(6\cdot5\cdot4+5\cdot5\cdot4\)
Simple Explanation
Last digit (0) या (5) हो सकता है, और (0) first digit पर restriction बदलता है। परीक्षा में divisibility by (5) में unit digit cases बनाएं। / The last digit can be (0) or (5), and (0) changes the first-digit restriction. In exams make unit-digit cases for divisibility by (5).
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