TS EAMCET · Maths · Permutation Combination
If all possible numbers are formed by using the digits without repetition and they are arranged in descending order, then the rank of the number is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(D)
Step-by-step Solution
Detailed explanation
Given numbers are 1, 2, 3, 5, 7. And also they are arranged in descending order. i.e., the numbers with four and five digits are included. The number of five-digit number=5! The number of four digits number =p45=5!(5-4)!=1201=120 The number of 3 digits…
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