Numbers Unit digit

Instructor: admin Duration: 16 mins


Note: at 4:21 (.......9)^2n will give 1 in units place

4 Comment(s)

Avatar Nabati Basu  0 Votes

@15:09 why did sir sy that we could ignore 222^36 ??

Login to reply
Avatar Instructor 

Sir meant to say that (222)^36 can be written as (222)^(4*9) we already know that the units place value in the result for any number consisting of 2 in the one's place and raised to the power 4multiple will be 6.Since we already know the value at units place for (222)^36 sir said so.

Login to reply

Avatar MRINMOY HALDER  0 Votes

at 5:09, 9 is not repeating of 4-cycle as 3 & 7. So 9^4n = 1 or 9^2n =1 ??

Login to reply
Avatar Instructor 

Yes, that is correct.Thanks for pointing it out.

Login to reply

© 2019 - All rights are reserved- AAIC Technologies pvt ltd