Kendriya Vidyalaya Hebbal

Give me info about class 11 physics ch2

A company purchased second hand machinery on 1st January, 2015 for 3,00,000, subsequent to which 60,000 and 40,000 were spent on its repairs and installation, respectively. On 1st July, 2016 another machinery was purchased for 2,60,000. On 1st July, 2017, the first machinery having become outdated was auctioned for. 3,00,000 and on the same date, another machinery was purchased for 2,50,000. On 1st July, 2018, the second machinery was also sold off and it fetched 2,30,000. Depreciation was provided on machinery @ 10% on the original cost annually on 31st December, the Fixed Instalment method. From 1st January, 2017, the method of providing depreciation was to Reducing Balance method from the date of asset coming into use, the rate being 15% p.a. You are required to prepare the following accounts in the books of the company :

Consider the set 𝑆 = { 𝑎 ∣ 𝑎 ∈ 𝑁 , 𝑎 ≤ 24 } S={a∣a∈N, a≤24}. Let 𝑅 1 and 𝑅 2 R 1 ​ and R 2 ​ be relations from 𝑆 S to 𝑆 S defined as 𝑅 1 = { ( 𝑥 , 𝑦 ) ∣ 𝑥 , 𝑦 ∈ 𝑆 , 𝑦 = 3 𝑥 } R 1 ​ ={(x,y)∣x,y∈S, y=3x} and 𝑅 2 = { ( 𝑥 , 𝑦 ) ∣ 𝑥 , 𝑦 ∈ 𝑆 , 𝑦 = 𝑥 2 } R 2 ​ ={(x,y)∣x,y∈S, y=x 2 }. Find the cardinality of the set 𝑅 1 ∖ ( 𝑅 1 ∩ 𝑅 2 ) R 1 ​ ∖(R 1 ​ ∩R 2 ​ )