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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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