(1) से (15) तक की संख्याओं में से (4) संख्याएं चुननी हैं जिनमें ठीक (2) संख्याएं (3) की गुणज हों। कितने चयन संभव हैं?
Choose (4) numbers from (1) to (15) such that exactly (2) numbers are multiples of (3). How many selections are possible?
Explanation opens after your attempt
B. (450)
Concept
There are (5) multiples of (3) and (10) non-multiples. The selection count is \(^{5}C_{2}\times{}^{10}C_{2}=450\).
Why this answer is correct
The correct answer is B. (450). There are (5) multiples of (3) and (10) non-multiples. The selection count is \(^{5}C_{2}\times{}^{10}C_{2}=450\).
Exam Tip
(3) के (5) गुणज और (10) गैर-गुणज हैं। चयन \(^{5}C_{2}\times{}^{10}C_{2}=450\) होगा।
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