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Question
How many three digit numbers have a digital root of 8 with an order 1?
Options:
A .  45
B .  36
C .  21
D .  28
E .  can’t be determined
Answer: Option B
:
B
Question is A+B+C=8, where A>0. So, question changes to A+B+C=7.
Using 1-0 method, answer is based on the arrangement of 7 zeroes and 2 ones =9C2=36

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