BPSC – Combined Competitive Examination · প্রশ্ন 9
Find the missing number from the given alternatives: 28 20 7 84 ? 12 45 25 9
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (B) 35
ব্যাখ্যা
In each row, first number × 5 = second × third (28×5 = 20×7 = 140; 45×5 = 25×9 = 225). So ? = 84×5 ÷ 12 = 35.
- (A) ভুল
Wrong: 30 × 12 = 360, but 84 × 5 = 420.
- (B) সঠিক
Correct: pattern: first × 5 = middle × third; 84 × 5 = 420 = 35 × 12.
- (C) ভুল
Wrong: 20 × 12 = 240, not 420.
- (D) ভুল
Wrong: 25 × 12 = 300, not 420.