Question

数列1,3,5,7,9,…的通项公式为( )A.an=2n-1B.an=1-2...

数列1,3,5,7,9,…的通项公式为( )A.an=2n-1B.an=1-2nC.an=3n-1D.an=2n+1

Answer 1

∵数列{an}各项值为1,3,5,7,9,…
∴各项构成一个以1为首项,以2为公差的等差数列,
∴an=2n-1
故选A.