国外英语考试-SAT Level 2-第1章数及其运算.docxVIP

国外英语考试-SATLevel2-第1章数及其运算

[单选题]1.al,a2,a3,a4,as,….,an

Inthesequenceofpositiveintegersabove,（江南博哥）al=a2=1,a3=2,a4=3,andas=5.Ifeachtermafterthesecondisobtainedbyaddingthetwotermsthatcomebeforeitandifan=55,whatisthevalueofn?

A.12

B.10

C.9

D.8

E.5

正确答案：B

参考解析：Followingthegivenruleforobtainingterms,writethetermsofthesequenceuptoandincluding55:1,1,2,3,5,8,13,21,34,55Since10numbersarelisted,n=10.

[单选题]2.Whatisthenextterminthesequence:2,8,32,128…?

A.512

B.510

C.452

D.324

E.550

正确答案：A

参考解析：Multiplyby4tofindthenextterminthesequence.Therefore,128×4=512.

[单选题]3.Thefirstterminageomedivicsequenceis3andthe4thtermis81.Whatisthe10thtermofthesequence?

A.177,147

B.59,049

C.19,683

D.6,561

E.2,187

正确答案：B

参考解析：Firstfindthecommonmultiplierneededtogetfrom3to81in3steps.Thisnumberis3.Sixmorestepsgetustothe10thterm.Therefore81×36=59049.

[单选题]4.Afterthefirstterminthesequencebelow,eachodd-numberedtermcanbefoundbymultiplyingtheprecedingtermbyfour,andeachevennumberedtermcanbefoundbymultiplyingtheprevioustermby.Whatisthevalueofthe76thterm?

240,60,…

A.60

B.80

C.120

D.240

E.360

正确答案：A

参考解析：Thepatternalternatesbackandforthbetween240and60.Eacheven-numberedtermis60,sothe76thtermis60.

[单选题]5.Thefirsttwotermsofasequenceare243and81.Eachtermafterthefirstisequaltoone-thirdofthepreviousterm.Whatisthevalueoftheeighthterm?

A.

B.

C.

D.

E.

正确答案：B

参考解析：Thefirsteighttermsare243,81,27,9,3,1,,.

[单选题]6.Whatisthenextterminthesequence:4,9,6,11,8,13?

A.18

B.16

C.10

D.9

E.8

正确答案：C

参考解析：Seethepatternbelow.Thesequence4,9,6,11,8,13isformedbyadding5andthensubtracting3.Wecanseethatthenextterminthesequencewillbe10.

[单选题]7.Ifthepatternoftheterms3continues,whichofthefollowingwouldbethe