wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

How many arrangements of four 3’s two 1’s and two 2’s are there in which 1 occurs before 2?

A
210
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
420
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
105
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
315
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A 210
Total Number of arrangements
=8422=420
Since there are two 1 ‘s, two 2’s, the number of arrangements say x in which 1 occurs before 2 is same as the 2 occurs before 1.2x=420x=210

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Permutations
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon