Discussion
Ajai ranks seventeenth in a class of thirty one. What is his rank from the last ?
Answer: C
Ajai's rank from the last is 15. If he ranks seventeenth from the top in a class of thirty one, there are sixteen students above him, so the number below him is the total minus his rank:
\[ 31 - 17 = 14 \]
That gives fourteen students below him, and his rank from the last is one more than that, since he himself counts:
\[ 14 + 1 = 15 \]
Option C is correct. Option B gives the number of students below him, without counting him.
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