21z5 a multiple of '9',where 'z' is a digit,find the value of 'z'
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Answer:
6
Step-by-step explanation:
divisibility rule for 9 is :sum of the digits of the number should be a multiple of 9
so,21z5 sum is 12. If we add 6 to the sum we will get 18
final answer is "6"
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