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How many ways are there to place (3) colours from (7) colours in top, middle and bottom positions?(7) रंगों में से (3) रंगों को ऊपर, बीच और नीचे के स्थान पर लगाने के तरीके कितने हैं?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (210)(210)
The three positions are distinct, so ({}^{7}P_{3}=7\times6\times5=210). Use permutation when positions have different names.तीनों स्थान अलग हैं इसलिए ({}^{7}P_{3}=7\times6\times5=210)। स्थानों के नाम अलग हों तो क्रमचय लें।
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