Question

Express in set builder method
$1) \: \: x = ({\frac{4}{5} , \: \frac{5}{6} , \: \frac{6}{7} , \: \frac{7}{8} \: , \frac{8}{9} , \: \frac{9}{10} })$
$2) \: \: b = ( - 40, \: - 35 \: , \: - 30......... + 20)$

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Answer 1

Answer:

{3, 6, 9, 12, 15}

= {x: x is a natural number divisible by 3 ;x< 18}

(ii) {2, 3, 5, 7, 11, 13, }

= {x : x is a prime number}

(iii) {1,4,9, 16,25,36}

= {x : x is a perfect square ; x < 36}

(iv) {0, 2, 4, 6, 8, 10, 12, }

= {x : x is a whole number divisible by 2}

(v) {Monday, Tuesday, Wednesday}

= {x : x is one of the first three days of 3 week}

(vi) {23, 25, 27, 29, }

= {x : x is an odd natural number; x ≥ 23}

(vii) {\frac { 1 }{ 3 },\frac { 1 }{ 4 },\frac { 1 }{ 5 },\frac { 1 }{ 6 },\frac { 1 }{ 7 },\frac { 1 }{ 8 }}

= {x: x = \frac { 1 }{ n } when n is a natural number: 3 ≤ n ≤ 8}

(viii) {42, 49, 56, 63, 70, 77}

= (x: x is a natural number divisible by 7 ; 42 ≤x ≤ 77} please mark brainlist answer

Answer 2

Answers

sadanandtripathi864

sadanandtripathi864 Ace

Answer:

{3, 6, 9, 12, 15}

= {x: x is a natural number divisible by 3 ;x< 18}

(ii) {2, 3, 5, 7, 11, 13, }

= {x : x is a prime number}

(iii) {1,4,9, 16,25,36}

= {x : x is a perfect square ; x < 36}

(iv) {0, 2, 4, 6, 8, 10, 12, }

= {x : x is a whole number divisible by 2}

(v) {Monday, Tuesday, Wednesday}

= {x : x is one of the first three days of 3 week}

(vi) {23, 25, 27, 29, }

= {x : x is an odd natural number; x ≥ 23}

(vii) {\frac { 1 }{ 3 },\frac { 1 }{ 4 },\frac { 1 }{ 5 },\frac { 1 }{ 6 },\frac { 1 }{ 7 },\frac { 1 }{ 8 }}

= {x: x = \frac { 1 }{ n } when n is a natural number: 3 ≤ n ≤ 8}

(viii) {42, 49, 56, 63, 70, 77}

= (x: x is a natural number divisible by 7 ; 42 ≤x ≤ 77} please mark brainlist answer