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A survey has (4) questions and each question has (3) answer choices. If the first two answers cannot be the same and the last two answers must be the same, how many response sheets are possible?एक सर्वे में (4) प्रश्न हैं और हर प्रश्न के (3) उत्तर विकल्प हैं। यदि पहले दो प्रश्नों के उत्तर समान नहीं हो सकते और अंतिम दो प्रश्नों के उत्तर समान होने चाहिए, तो कुल उत्तर-पत्र कितने होंगे?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (18)(18)
The first question has (3) choices, the second has (2), the third has (3), and the fourth matches the third. Thus (3 \times 2 \times 3).पहले प्रश्न के (3), दूसरे के (2), तीसरे के (3) और चौथा तीसरे जैसा होगा। इसलिए (3 \times 2 \times 3) मिलता है।
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