If an=22n+1 then for  n>1 , last digit of an is 

If an=22n+1 then for  n>1 , last digit of an is 

  1. A

    5

  2. B

    7

  3. C

    3

  4. D

    4

    Fill Out the Form for Expert Academic Guidance!l



    +91



    Live ClassesBooksTest SeriesSelf Learning



    Verify OTP Code (required)

    I agree to the terms and conditions and privacy policy.

    Solution:

    For n=2,an=24+1=16+1=17. . Assume 

    That ak=22k+1=10m+7  where  k>1

    and m is some positive   integer.

    Now, ak+1=22k+1+1=22k2+1=(10m+6)2+1=1010m2+12m+3+7

    Thus, last digit of an  is 7n>1

    Chat on WhatsApp Call Infinity Learn

      Talk to our academic expert!



      +91


      Live ClassesBooksTest SeriesSelf Learning




      Verify OTP Code (required)

      I agree to the terms and conditions and privacy policy.