Selina solutions

Selina solutions

Selina solutions

Grade 7

CHAPTERS

3. Fractions (Including Problems)

4. Decimal Fractions (Decimals)

5. Exponents (including Laws of Exponents)

6. Ratio and Proportion (Including Sharing in a Ratio)

7. Unitary Method (including Time and Work)

11. Fundamental Concepts (Including Fundamental Operations)

12. Simple Linear Equations (Including Word Problems)

13. Set Concepts (Some Simple Divisions by Vedic Method)

14. Lines and Angles (Including Construction of angles)

17. Symmetry (Including Reflection and Rotation)

18. Recognition of Solids (Representing 3-D in 2-D)

Q1) Write the cardinal number of each of the following sets:

(i) A = Set of days in a leap year.

(ii) B = Set of numbers on a clock-face.

(iii) C = {x : x ∈ N and x ≤ 7}

(iv) D = Set of letters in the word “PANIPAT”.

(v) E = Set of prime numbers between 5 and 15.

(vi) F = {x : x ∈ Z and – 2 < x ≤ 5}

(vii) G = {x : x is a perfect square number, x ∈N and x ≤ 30}.

Solution:

(i) The number of days in leap year is 366.

∴ n A = 366

(ii) The number on clock face is 12.

∴ n B = 12

(iii) The total number of set is 7.

∴ n C = 7

(iv) The number of letters in PANIPAT is 5.

∴ n D = 5

(v) The number of prime number between 5 and 13 is 3.

∴ n E = 3

(vi) The total numbers between -2 and 7 is 7.

∴ n F = 7

(vii) There are 5 perfect square numbers less thn 30.

∴ n G = 5

Still have questions? Our expert teachers can help you out

Book a free class nowFractions (Including Problems)

Exponents (including Laws of Exponents)

Ratio and Proportion (Including Sharing in a Ratio)

Unitary Method (including Time and Work)

Fundamental Concepts (Including Fundamental Operations)

Simple Linear Equations (Including Word Problems)

Set Concepts (Some Simple Divisions by Vedic Method)

Lines and Angles (Including Construction of angles)

Symmetry (Including Reflection and Rotation)

Recognition of Solids (Representing 3-D in 2-D)

Q1) Write the cardinal number of each of the following sets:

(i) A = Set of days in a leap year.

(ii) B = Set of numbers on a clock-face.

(iii) C = {x : x ∈ N and x ≤ 7}

(iv) D = Set of letters in the word “PANIPAT”.

(v) E = Set of prime numbers between 5 and 15.

(vi) F = {x : x ∈ Z and – 2 < x ≤ 5}

(vii) G = {x : x is a perfect square number, x ∈N and x ≤ 30}.

Solution:

(i) The number of days in leap year is 366.

∴ n A = 366

(ii) The number on clock face is 12.

∴ n B = 12

(iii) The total number of set is 7.

∴ n C = 7

(iv) The number of letters in PANIPAT is 5.

∴ n D = 5

(v) The number of prime number between 5 and 13 is 3.

∴ n E = 3

(vi) The total numbers between -2 and 7 is 7.

∴ n F = 7

(vii) There are 5 perfect square numbers less thn 30.

∴ n G = 5

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