1.

Write each of the following beleow in set- builder form: (i) `A ={1, (1)/(4),(1)/(9),(1)/(16),(1)/(25),(1)/(36),(1)/(49)}` (ii) `B ={ (1)/(2),(2)/(5),(3)/(10),(4)/(17),(5)/(26),(6)/(37),(7)/(50)}` (iii) `B ={53,59,61,71,79}` (iv) `D={-1,1}` (v) `E={14,21,28,35,42,...,98}`

Answer» Correct Answer - (i) `A={ x:x =(1)/(n^2) , n in N and 1 le n le 7} `
(ii) ` B=({ x:x =(n)/((n^2 +1)),n in N and 1 le n le 7}`
(iii) ` C={x:x "is prime ", 50 lt x lt 80}`
(iv) `D={x:x in Z, x^2 =1}`
(v) `E=(x:x 7n , n in N, 2 le n le 14}`


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