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akshita agrawal

· started a discussion

· 1 Months ago

can anyone explain (Question: 217520.0 )

1921+2121=4042 so how 4042 is divisible by 10 and 20

Question:
1921 + 2121 is divisible by –
Options:
A) 10 only 
B) 20 only 
C) Both 10 and 20
D) Neither 10 nor 20
Solution:
Ans: (c)

1921 + 2121 = (20 – 1)21 + (20 + 1)21

Remainder = –1 + 1

= 0

So, (1921 + 2121) is divisible by 20 and 10.

Knowledge Expert

· commented

· 1 Months ago

Dear Student,

In this question 19^21 and 21^21 ( both 21 after ^, are exponent). we fixed in explanation.

Hope you have a great learning with us!!

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