Digits (1,2,3,4,5,6,7,8) से repetition allowed (6)-digit numbers में exactly (3) even digits हों, तो count क्या है?
Using digits (1,2,3,4,5,6,7,8) with repetition allowed, if exactly (3) even digits occur in (6)-digit numbers, what is the count?
Explanation opens after your attempt
A. \(^{6}C_3\cdot4^3\cdot4^3\)
Simple Explanation
Even positions चुनें और फिर even तथा odd choices independently multiply करें। परीक्षा में exactly digit type में positions first choose करें। / Choose the even positions and then multiply even and odd choices independently. In exams choose positions first in exactly digit-type problems.
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