Please explain

[ketkoag]

What is the greatest common factor of the positive integers j and k?
(1) k = j + 1
(2) jk is divisible by 5

OA d??

[scoobydooby]

am getting A

stmnt 1) k = j + 1

=> j and k are consecutive integers and positive.
so the greatest common factor between them will be 1.
(one will be even and one odd)
sufficient

stmnt 2) jk is divisible by 5

if jk=5, say j=5, k=1 gcd: 1
if jk=25, j=5, k=5, gcd:5 or if j=25, k=1, gcd=1
we dont get a unique gcd
not sufficient

hence A

[rs2010]

I second Scoobydooby ,answer should be A.

[ketkoag]

thanks for the reply.... i also got A as the answer but OA is D,
so it might be possible that the oa is incorrect..