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CBSE Class 10 Answered

all 4 que are my doubt
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Asked by ranjitkaur112296 | 10 Apr, 2020, 03:28: PM
answered-by-expert Expert Answer
1.
i) 5 x 11 x 13 + 13 = 13(5 x 11 + 1) = 13(55 + 1) = 13 x 56 = 13 x 7 x 8 
It is a composite number as it has factors other than 1 and itself
 
ii) 6 x 5 x 4 x 3 x 2 x 1 + 5 = 5(6 x 4 x 3 x 2 x 1 + 1) = 5(192+1) = 5 x 193   
It is a composite number as it has has factors other than 1 and itself
 
2)
If a number is the form 4n 
It can be written as (22)n = (2n)2 
Square a number has 0 at the end if the number has 0 in it
2n never has 0 at the end
Therefore, (2n)2 will never have 0 at the end.
Hence, the number of the form 4n can never end with the digit 0.
Answered by Renu Varma | 11 Apr, 2020, 08:53: PM

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