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If integer a is divisible
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28 Jan 2021, 14:49
28 Jan 2021, 14:49
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50% (00:54) correct
50% (00:48) wrong based on 2 sessions
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If integer a is divisible by both 3 and 14, which of the following must be true?
Indicate all such statements.
1) a is divisible by 6
2) a is equal to 42
3) a is divisible by 21
4) a is positive
Indicate all such statements.
1) a is divisible by 6
2) a is equal to 42
3) a is divisible by 21
4) a is positive
Re: If integer a is divisible
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28 Jan 2021, 20:13
28 Jan 2021, 20:13
Integer a divisible by BOTH 3 & 14
14 = 2*7
Hence integer a will ALWAYS be a multiple of 2 3 7 hence will be a multiple of 42
Let's go through the option
1) a is divisible by 6
Correct
as a will be multiple of 2 & 3
2) a is equal to 42
Not necessary
a can be 84, 126,...
3) a is divisible by 21
Correct
as a will be multiple of 7 & 3
4) a is positive
Not necessary
a can be 0, -42, -84 as well. It is not mentioned that a is positive.
The answer should be A & C
14 = 2*7
Hence integer a will ALWAYS be a multiple of 2 3 7 hence will be a multiple of 42
Let's go through the option
1) a is divisible by 6
Correct
as a will be multiple of 2 & 3
2) a is equal to 42
Not necessary
a can be 84, 126,...
3) a is divisible by 21
Correct
as a will be multiple of 7 & 3
4) a is positive
Not necessary
a can be 0, -42, -84 as well. It is not mentioned that a is positive.
The answer should be A & C
Re: If integer a is divisible
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28 Jan 2021, 22:39
28 Jan 2021, 22:39
Expert Reply
Correct.
Fixed
Posted from my mobile device
Fixed
Posted from my mobile device
