Question

a. A = {x | x is a positive integer

less than 10 and 2^x

–1 is an odd

number}​

Answer 1

Answer:

A = 1 to 9

Step-by-step explanation:

A = {x | x is a positive integer  

less than 10 and 2^x

–1 is an odd  

number}​

x is postive integers less than 10

so x can vary from 1 to 9

2ˣ - 1 should be an odd number

=> 2ˣ = odd number + 1

=> 2ˣ = Even Number

which is true for every positive integer

so x can be any number from 1 to 9

A = 1 to 9

if  i consider

A. A = {x}

=> A² = x

=> A² = 1 , 4 , 9 for integer values of A

then A = 1 , 2  & 3