1.

Write the following sets iroster from: K = {x : ϵ N, x is a multiple of 5 and x2 < 400}.

Answer»

Multiple of 5 are 5, 10, 15, 20, 25, 30, … 

So, 52 = 25 

102 = 100 

152 = 225 

202 = 400 

252 = 625 > 400 

The elements which are multiple of 5 and x2 < 400 are 5, 10, 15 

So, K = {5, 10, 15}



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