A.........B........C.........D The integers A, B, C, and D shown on the number line above are all equally spaced. If C and D are equal to 512 and 513, respectively, what is the value of A? 511 510 -512 (-7)512 (-12)513 i have choosen B

Looks correct. The points are equidistant, and the difference between C and D is 1, hence working backwards from C, B is 511 and A is 510. Whats the OA?

pradeepkaushal9518 wrote:A.........B........C.........D The integers A, B, C, and D shown on the number line above are all equally spaced. If C and D are equal to 512 and 513, respectively, what is the value of A? 511 510 -512 (-7)512 (-12)513 i have choosen B I think you have mistyped the problem. it could have been 5^12, 5^13 in that case: diff = 5^13-5^12 = 5^12(5-1)= 4*5^12 now A = 5^12 - 2(4*5^12) A=5^12(1-8) =(-7)5^12 pick D

pradeepkaushal9518 wrote:A.........B........C.........D The integers A, B, C, and D shown on the number line above are all equally spaced. If C and D are equal to 512 and 513, respectively, what is the value of A? 511 510 -512 (-7)512 (-12)513 i have choosen B B is fine. that is the only option which satisfies the condition. working backwards. D is 513, C is 512, B is 511 so A will be 510. do you have the OA? Preet

IMO B Since A,B,C,D are equally spaced,let says differ by constant k. C=A+2k 512=A+2k D=A+3k 513=A+3k K=1 C=A+2k 512=A+2k D=A+3k 513=A+3k K=1 512=A+2 A=510

If its 5^12 and 5^13 then the answer is D C=A+2k 5^12=A+2k D=A+3k 5^13=A+3k k=5^13-5^12 =5^12(4) C=A+2k 5^12=A+8.5^12 A=-7(5^12) Hence D

According to the given question the answer would be 510 i.e. B only ...but I don't think that would anyhow match a GMAT problem .. I think kvcpk is correct and answer would be D. preet would u tell if u have left " ^ " the power sign ..

shashank.ism wrote:According to the given question the answer would be 510 i.e. B only ...but I don't think that would anyhow match a GMAT problem .. I think kvcpk is correct and answer would be D. preet would u tell if u have left " ^ " the power sign .. i agree with you on that. if the question was as is looks it would not qualify as a GMAT question. but if there is an edit to the question by pradeepkaushal9518 we would be able to solve it. though D is fine if you go with 5^12 and 5 ^13 Preet