@clock, technically you are absolutely right!!! ... and welcome to the GMAT math conventions. Please read below a fragment from the BTG thread, the content copied/pasted belongs to Ron Purewal and hear how an informed test taker could reason one's solution (though, it doesn't help to excel in exam
)
"
... under the traditional mathematical definition, yes, 0 and negative multiples are counted as 'multiples'.
HOWEVER,
to date, as far as i know, there has never been an official problem requiring the use of 0 or negative numbers as 'multiples' of positive integers. in fact, every single problem dealing with factors, multiples, primes, divisibility, and the like has been restricted, by fiat, to positive integers."
Source
https://www.beatthegmat.com/negative-mul ... 12560.html
Therefore, my friend I chose
B-opsss,
you could also mention -ve multiples in your analysis of st(2)
clock60 wrote:here i got E
(1) n-even integer
if n=0, 10=2^0*10+0 remaider 0 ( 0 is even)
if n=2, 10=(2^2)*2+2 remaider 2
if n=4, 10=2^4*0+10 remaider 10
not suff
(2) n is multiple of 4
if n=0 remaider 0 (0 is a multiple of 4)
if n=4 then 10=2^4*0+10 remaider 10
not suff
together we have two versions 0 and 10 so both insuff
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