#Aptitude_Solution

Correct answer is GIVEN,
Don't proceed if above poll not attempted..
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R is 24th from back and Q is 15th from back.
This means, there are 24-15-1 = 8 persons between Q and R.
Since, R is exactly in middle of P and Q, number of persons between P & R will be same as number of persons between Q & R.
Thus, number of persons between P and R will also be 8.
Hence total persons
= 21+8+1+8+15
= 53