Set problem

[mgmt_gmat]

K is a set of integers such that if the integer r is in K, then r + 1 is also in K. Is 100 in K?
(1) 50 is in K.
(2) 150 is in K.

[ajith]

K is a set of integers such that if the integer r is in K, then r + 1 is also in K. Is 100 in K?
(1) 50 is in K.
(2) 150 is in K.

1) 50 is in K, 51 is in K , 52 is in K ....100 is also in K; sufficient
2) 150 is in K ; insufficient ; since 150 is in K we can say that 151 is in K, we cannot say that 149 is in K

Hence A