AP EAMCET · Maths · Permutation Combination
Number of four digit numbers that can be formed using all the digits except zero such that every number has exactly 2 distinct digits in it is
- A 189
- B 216
- C 288
- D 504
Answer & Solution
Correct Answer
(D) 504
Step-by-step Solution
Detailed explanation
Two distinct digits can be choosen out of 9 digits is in \({ }^9 \mathrm{C}_2=36\) ways now we can form \(2^4\) different 4 digit numbers from which wecan excludethe two cases…
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