[問題]GWD 11-26

[cimim]

Q26:
What is the greatest common factor of the positive integers j and k?
(1) k = j + 1
(2) jk is divisible by 5.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案A 怎麼算的呢???

[yuying]

Q26:
What is the greatest common factor of the positive integers j and k?
(1) k = j + 1
(2) jk is divisible by 5.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案A 怎麼算的呢???

條件1: 連續兩正整數, 最大公因數是1