GWD 25-7,10,16

abiding

Q7

If n is a positive integer, what is the remainder

When (7^(4n+3))(6^n) is divided by 10?

A.      1

B.      2

C.      4

D.     6

E.      8

Q10

     The sides of a square region, measured to the

         nearest centimeter, are 6 centimeters long. The

         least possible value of the actual area of the

         square region is

A.36.00 sq cm

B.35.00 sq cm

C.33.75 sq cm

D.30.25 sq cm

E.25.00 sq cm

Q16

If √x is an integer, what is the value of √x?

(1)    11<x<17

(2)    2<√x<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.

talksky

Q7

If n is a positive integer, what is the remainder

When (7^(4n+3))(6^n) is divided by 10?

A.      1

B.      2

C.      4

D.     6

E.      8

=(7^3)*((7^4))^n*6^n

7^3=343

6^n 的个位是6

7^4个位是1

所以(7^(4n+3))(6^n) 的个位是8

E is the best

Q10

     The sides of a square region, measured to the

         nearest centimeter, are 6 centimeters long. The

         least possible value of the actual area of the

         square region is

A.36.00 sq cm

B.35.00 sq cm

C.33.75 sq cm

D.30.25 sq cm

E.25.00 sq cm

5.5^2=30.25

D is the best

Q16

If √x is an integer, what is the value of √x?

(1)    11<x<17

(2)    2<√x<5

E is the best

从1得出x为9 OR 16

从2得出x为9 or 16

x 不唯一

________________________________________________________________

     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

zhouchlcy

Q16的（1）不是只能得出X=16吗

nn帮忙解释一下，谢谢

mickleon

Q7：最傻的办法，只算末尾乘除法，溢出位直接抛弃，也很快能做出来

Q10：很简单的计算，同意

Q16：(1)能推出 √x 只能是4 （2）3或4都可能 所以我觉得也是该选A

zhouchlcy

同意Q16选A