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25 Dec 2023, 02:30
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
56% (01:24) correct
44%
(01:20)
wrong
based on 72
sessions
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Does the average (arithmetic mean) of a, b, and c equal c?
(1) c - a = c + b
(2) c = 0
(1) c - a = c + b
(2) c = 0
25 Dec 2023, 06:20
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Is \(\frac{a+b+c}{3} = c\)?
Is \(a+b = 2c\)?
(1) c - a = c + b
a+b=0
But we have no info about c. Insufficient.
(2) c = 0
But we have no info about a+b. Insufficient.
(3) a+b=0 & c=0 (Sufficient. Hence, C IMO)
Is \(a+b = 2c\)?
(1) c - a = c + b
a+b=0
But we have no info about c. Insufficient.
(2) c = 0
But we have no info about a+b. Insufficient.
(3) a+b=0 & c=0 (Sufficient. Hence, C IMO)
25 Dec 2023, 18:49
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From 1, we get a+b=0.
Mean of a,b,c will be c/3 then. Which infers that the mean will not be equal to c. Hence, Sufficient.
From 2, we get the mean as (a+b)/3.
Now, a+b can be 0 and can be any integer. Hence, Insufficient.
IMO, A. Please let me know if I missed anything
Posted from my mobile device
Mean of a,b,c will be c/3 then. Which infers that the mean will not be equal to c. Hence, Sufficient.
From 2, we get the mean as (a+b)/3.
Now, a+b can be 0 and can be any integer. Hence, Insufficient.
IMO, A. Please let me know if I missed anything
Posted from my mobile device
