Question

State with reason, which of the following are sets and which are not

(i) All big rivers of India.
(ii) All natural numbers having at least one prime factor.
(iii) All sincere students of Ravenshaw College during the academic year 1998-99.
(iv) All real numbers with negative square.
(v) All citizens of India earning more than Rs. 10,000/- per month.
All college teachers who are citizens of India.
(vii) All finite subsets of the set Z of integers.
(viii) Collection of all sets.
(ix) Collection of all winged horses.​

Answer 1

Step-by-step explanation:

1,5,7,8,9 are not a set bcoz it varies from place to place.

2,3,4,6 are sets bcoz it is well defined.

plz make it as brainliest.

but brainliest.

Answer 2

Step-by-step explanation:

all big river of india

collection of all sets