Question

1.
Q.1 (A) Select the correct alternative and write it.
The number of proper subsets of the set {3,4,5,6,7} is
A) 32
B) 31
C) 30
D) 35​

Answer 1

Answer:

31

Step-by-step explanation:

Number of proper subsets of a set containing n elements can be given as 2n-1. Here, A contains 5 elements. So,number of proper subsets of set A will be =25-1=31.

Answer 2

Step-by-step explanation:

An ecosystem is a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life. Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. ... Ecosystems can be very large or very small.

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