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Standard VI

Mathematics

Prime and Composite Numbers

Which of the ...

Question

Which of the following are co-primes?
(a) 8, 12
(b) 9, 10
(c) 6, 8
(d) 15, 18

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Solution

(b) 9, 10

(a) 8, 12 are not co-primes as they have a common factor 4.
(b) 9, 10 are co-primes as they do not have a common factor.
(c) 6, 8 are not co-primes as they have a common factor 2.
(d)15,18 are not co-primes as they have a common factor 3.

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Similar questions

If A = {3, 6, 9, 12, 15, 18, 21}
B = {2, 4, 6, 8, 10, 12, 14, 16}
C = {5, 10, 15, 20}

$\begin{matrix} A & B 1. B - C & A . {5, 10, 20} 2. A - C & B . {3, 9, 15, 21} 3. C - (A - B) & C . {3, 6, 9, 12, 18, 21} 4. C \cap (A - B) & D . {15} E . {2, 4, 6, 8, 12, 14, 16} \end{matrix}$

Q. If

A = {3, 6, 9, 12, 15, 18, 21}; B = {4, 8, 12, 16, 20}

C = {2, 4, 6, 8, 10, 12, 14, 16}; D = {5, 10, 15, 20}

; find
(i)

A - B

(ii)

B - A

(iii)

C - A

(iv)

D - A

(v)

B - C

(vi)

B - D

(vii)

C - B

(viii)

D - B

Q. If

A = {3, 6, 9, 12, 15, 18, 21}, B = {4, 8, 12, 16, 20},

C = {2, 4, 6, 8, 10, 12, 14, 16}, D = {5, 10, 15, 20};

find
(i)

A - B

(ii)

A - C

(iii)

A - D

(iv)

B - A

(v)

C - A

(vi)

D - A

(vii)

B - C

(viii)

B - D

(ix)

C - B

(x)

D - B

(xi)

C - D

(xii)

D - C

Q. If

A = {3, 6, 9, 12, 15, 18, 21}, B = {4, 8, 12, 16, 20}

C = {2, 4, 6, 8, 10, 12, 14, 16}, D = {5, 10, 15, 20}

, find

(i) A - B

(i i) A - C

(i i i) A - D

(i v) B - A

(v) C - A

(v i) D - A

(v i i) B - C

(v i i) B - D

(i x) C - B

(x) D - B

(x i) C - D

(x i i) D - C

Q. Find the median of the following data.

Group	$6 - 8$	$8 - 10$	$10 - 12$	$12 - 14$	$14 - 16$	$16 - 18$	$18 - 20$
Frequencies	$12$	$20$	$16$	$15$	$17$	$8$	$12$

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Which of the following are co-primes? (a) 8, 12 (b) 9, 10 (c) 6, 8 (d) 15, 18

(b) 9, 10(a) 8, 12 are not co-primes as they have a common factor 4.(b) 9, 10 are co-primes as they do not have a common factor.(c) 6, 8 are not co-primes as they have a common factor 2.(d)15,18 are not co-primes as they have a common factor 3.

Which of the following are co-primes?
(a) 8, 12
(b) 9, 10
(c) 6, 8
(d) 15, 18

(b) 9, 10

(a) 8, 12 are not co-primes as they have a common factor 4.
(b) 9, 10 are co-primes as they do not have a common factor.
(c) 6, 8 are not co-primes as they have a common factor 2.
(d)15,18 are not co-primes as they have a common factor 3.