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Q)

# A student is ranked 13th from right and 8th from left. How many students are there in total?

( A ) 19
( B ) 21
( C ) 20
( D ) 18

A student is ranked $13^{th}$ from right
$\implies$ He has 12 students in his right side and $8^{th}$ from left means
$\implies$ He has 7 students in his left side so total no. of students are
$\implies 20$