Numbers –24 (CAT-2005)

The right most non zero digit of the number 30²⁷²⁰ is?

(1)1     (2)3     (3)7     (4)9

Solution follows here:

Solution:

30²⁷²⁰ = 3²⁷²⁰ * 10²⁷²⁰ 

The right most non-zero digit of the product is nothing but the right most digit of 3²⁷²⁰, which can be found out easily for the concept on “unit digit pattern of exponents”

Answer (1)