QA – 安置测验|数字、LCM 和 HCF |问题 3

乘积 (267) ¹⁵³ x (66666) ⁷²中的单位数字是多少？
(一) 7
(乙) 6
(三) 1
(四) 2答案： （D）
解释：我们只需要找到个位。

In 267 unit digit is 7 and cyclicity of 7 is 4.
So, (267)153 can be written as (267)Rem(153)/4 = (267)1
Unit digit of (267)1 = 7.
similarly for 66666 unit digit is 6 and cyclicity for 6 is 1.
Unit digit for (66666)72 = 6.
Therefore , Unit digit of the resultant is 7 * 6 = 2Quiz of this Question