16, 33, 65, 131, 261, ( [গণিত] )
ক. 523
খ. 521
গ. 613
ঘ. 721
উত্তর: 523
ব্যাখ্যা: Each number is twice the preceding one with 1 added or subtracted alternately. অর্থাৎ 16×2+1=33; 33 × 2-1=65; 65×2+1=131, 131 × 2-1 = 261. ∴ next X number = 2 × 261 + 1 = 523.
Admission FBS University papers MCQ — Prosthuti প্রশ্নব্যাংক
Admission · FBS · University papers · MCQ