Multiple choice Directions: Complete the following number series. 11, 15, 27, 63, 171, ?, 1467 495 279 387 603 711 Reveal answer Fill a bubble to check yourself A Correct answer Explanation The pattern of the given number series is +4, +(4 x 3), +(12 x 3), +(36 x 3) and so on. So, the missing term is 171 + (108 x 3) = 495.