LCM and HCF
 L.C.M of 3/4, 6/7, 9/8 is ?

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L. C . M = ( L.C.M of 3, 6, 9 ) / (H.C.F of 4, 7, 8)
Correct Option: A
L. C . M = ( L.C.M of 3, 6, 9 ) / (H.C.F of 4, 7, 8)
= 18 / 1
= 18
 H.C.F . of 1/2, 3/4, 5/6, 7/8, 9/10 is ?

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H.C.F = ( H.C.F of 1, 3 , 5, 7, 9) / (L.C.M of 2, 4, 6, 8 , 10)
Correct Option: D
H.C.F = ( H.C.F of 1, 3 , 5, 7, 9) / (L.C.M of 2, 4, 6, 8 , 10)
= 1 / 120
 L.C.M of 3^{3}, 4, 4^{2} and 3 is ?

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L.C.M of 3^{3}, 4, 4^{2} and 3 = L.C.M of 3^{3} x 2^{4}
Correct Option: C
L.C.M of 3^{3}, 4, 4^{2} and 3 = L.C.M of 3^{3} x 2^{4}
= 27 x 16
= 432
 L.C.M of 87 and 145 is ?

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H.C.F of 87 and 145 is 29
∴ L.C.M = ( 87 x 145) / 29Correct Option: C
H.C.F of 87 and 145 is 29
∴ L.C.M = ( 87 x 145) / 29
= 435
 Which of the following is a pair of coprimes ?

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H.C.F . of 18 and 25 is 1
So, 18 and 25 are coprimesCorrect Option: B
H.C.F . of 18 and 25 is 1
So, 18 and 25 are coprimes