Here the given number series 625, 625, 600, ?, 475, 875 follows a pattern that
625
625 + (0 x 0) = 625
625 - (5 x 5) = 625 - 25 = 600
600 + (10 x 10) = 600 + 100 = 700
700 - (15 x 15) = 700 - 225 = 475
475 + (20 x 20) = 475 + 400 = 875
Hence, the missing number in the given number series is 700.
