Let 
and 
. Let 
be a relation defined on 
such that 
, 
and 
. Then the number of elements in the set 
is
Text Solution
Verified by ExpertsD
We have, 
and 
At 
, there are 5 choices for 
;
, there are 4 choices for 
;
, there are 4 choices for 
;
, there are 2 choices for 
;
, there are 1 choice for 
;
∴ Total ways for 
Now, at 
, there are 4 choices for 
;
, there are 3 choices for 
;
, there are 2 choices for 
;
, there are 1 choice for 
Total ways for 
∴ 
Required number of ways 
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