What least number must be added to 9879, so that the sum is completely divisible by 10 ?  Choose the correct choice from the following: A) 3 B) 4 C) 1 D) 2 E) 6
If we divide 9879 by 10 remainder is 9   10-9= 
<gadget id="calculator">10-9</gadget>
<output>1</output>
1   Answer : 1
<result>C</result>
What least number must be added to 9879, so that the sum is completely divisible by 10 ?