COMEDK · Maths · 4. Permutation Combination
The sum of all 4-digit numbers that can be formed by using the digits \(2,4,6,8\) (repetition of digits is not allowed) is
- A 133320
- B 123330
- C 113230
- D 323430
Answer & Solution
Correct Answer
(A) 133320
Step-by-step Solution
Detailed explanation
There are \(4 !=24\) numbers. Each digit occurring \(3 !=6\) times, in the unit's, ten's, hundred's and thousand's places. We note that \((2+4+6+8)=120\). Thus in the over all sum there will be 120 units, 120 tens, 120 hundreds and 120 thousands. The required sum…
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