Planning to take coaching on Unacademy
http://bit.ly/gate_unacademy
or
https://unacademy.com/
here is a code for 10% off PLUS1BPK1
Telegram Notification Group link:-
https://t.me/joinchat/X5egW_cvdt9kMGY1
Telegram discussion Group link:-
https://t.me/joinchat/VCyGUmVq8RNkMzhl
Downloads resources from here
https://education4fun.com/gate-cse/
MCQ (Single Correct Answer)
GATE CSE 1995
Let A be the set of all nonsingular matrices over real numbers and let * be the matrix multiplication operator. Then
A) A is closed under * but A,∗ is not a semigroup.
B) A,∗ is a semigroup but not a monoid.
C) A,∗ is a monoid but not a group.
D) A,∗ is a group but not an abelian group
