एक (4)-स्थान संकेत में हर स्थान पर (3) रंग उपलब्ध हैं। पहला और तीसरा रंग समान होना चाहिए। पुनरावृत्ति मान्य है। कुल संकेत कितने हैं?
In a (4)-place signal (3) colors are available at each place. The first and third colors must be the same. Repetition is allowed. How many signals are possible?
Explanation opens after your attempt
Correct Answer
A. (27) संकेत(27) signals
Concept
There are (3) choices for the first place the third is then fixed and the second and fourth places have (3,3) choices. The total is \(3 \times 3 \times 3=27\).
Why this answer is correct
The correct answer is A. (27) संकेत / (27) signals. There are (3) choices for the first place the third is then fixed and the second and fourth places have (3,3) choices. The total is \(3 \times 3 \times 3=27\).
Exam Tip
पहले स्थान के (3) विकल्प हैं तीसरा वही तय होगा और दूसरे तथा चौथे स्थान पर (3,3) विकल्प हैं। कुल \(3 \times 3 \times 3=27\) है।
Login to save your score, XP, coins and progress.