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29 Oct 2022, 08:30
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C
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Difficulty:
45%
(medium)
Question Stats:
57% (01:08) correct
43%
(01:05)
wrong
based on 154
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If x is a multiple of 9 and of 21, then x must also be a multiple of which of the following?
I. 7
II. 63
III. 189
A. II only
B. III only
C. I and II
D. II and III
E. I, II, and III
I. 7
II. 63
III. 189
A. II only
B. III only
C. I and II
D. II and III
E. I, II, and III
29 Oct 2022, 09:26
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LCM of 9 & 21 is 63.
So, x will definitely be a multiple of 7 (a factor of 21) and 63 (LCM of 7 & 21).
X may or may not be a factor of 63*3= 189.
Option C IMO
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So, x will definitely be a multiple of 7 (a factor of 21) and 63 (LCM of 7 & 21).
X may or may not be a factor of 63*3= 189.
Option C IMO
Posted from my mobile device
30 Oct 2022, 09:41
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If x is a multiple of 9 and of 21, then x must also be a multiple of LCM of 9 and 21 i.e. 63 (II)
If x is a multiple of 21, it is also a multiple of its factors i.e. 1, 3 and 7 (I)
x may or may not be a multiple of 189 (III).
MUST BE TRUE- I and II.
Answer is C.
If x is a multiple of 21, it is also a multiple of its factors i.e. 1, 3 and 7 (I)
x may or may not be a multiple of 189 (III).
MUST BE TRUE- I and II.
Answer is C.
