Permutation Combination Question 1
Question 1 - 24 January - Shift 1
The number of 9 digit numbers, that can be formed using all the digits of the number 123412341 so that the even digits occupy only even places, is ________
Show Answer
Answer: 60
Solution:
Formula: Non-consecutive selection
Even digits occupy at even places
$\frac{4 !}{2 ! 2 !} \times \frac{5 !}{2 ! 3 !}=\frac{24 \times 120}{4 \times 12}=60$
