11. Which of the following is a pair of co-primes?
a) (16, 62) b) (18, 25)
c) (21, 35) d) (23, 92)
12. The H.C.F. of 2923 and 3239 is:
a) 37 b) 47
c) 73 d) 79
13. The H.C.F. Of 3556 and 3444 is:
a) 23 b) 47
c) 26 d) 28
14. The L.C.M. of 2² x 3² x 5 x 11, 2⁴ x 3⁴ x 5² x 7² x 11 is:
a) 2² x 3² x 5 b) 2⁵ x 3⁴ x 5³
c) 2² x 3² x 5 x 7 x 11 d) 2⁵ x 3⁴ x 5³ x 7² x 11
15. Find the lowest common multiple of 24, 36 and 40.
a) 120 b) 240
c) 360 d) 480
16. The L.C.M. of 22, 54, 108, 135 and 198 is:
a) 330 b) 1980
c) 5940 d) 1188
17. The L.C.M. of 148 and 185 is:
a) 680 b) 740
c) 2960 d) 3700
18. The H.C.F. of 2/4, 8/9, 64/81 and 10/27 is:
a) 2/3 b)2/81
c) 160/3 d) 160/81
19. The H.C.F. Of 9/10, 12/25, 18/35 and 21/40 is:
a) 3/5 b) 252/5
c)3/2800 d) 63 / 700
20. The L.C.M. Of 1/3. 5/6. 2/9, 4/13 is:
a)1/54 b) 10/27
c) 20/3 d) none of these.
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