Find the missing number in the series: 138, 210, 66, 282, -6, ? Banking RBI Grade B Prelims Medium Number System (including HCF LCM) MCQ Question Find the missing number in the series: 138, 210, 66, 282, -6, ? Options A. 354 B. 320 C. 336 D. 348 E. 360 number seriespattern recognitionsequence