1 . If number a is 22×31×50andbis21×31×51then1cmofa,bis:

• A. 2 2 × 3 1 × 5 1
• B. 2 2 × 3 2 × 5 2
• C. 2 3 × 3 1 × 5 0
• D. 2 2 × 3 2 × 5 0

Answer: Option A

Explanation:

2 . 2×3=812,4×5=1620

• A. 2428
• B. 2442
• C. 42
• D. 1214

Answer: Option A

Explanation:

3 . যদি 2×3 = ৮১২, 4×5 = ১৬২০ হয়, তবে 6×7 = কত?

• A. ২৪২৮
• B. ২৪৪২
• C. ৪২
• D. ১২১৪

Answer: Option A

Explanation:

4 . 2×3

• A. $4\times 2$
• B. $2\times 4$
• C. $3\times 3$
• D. $3\times 4$

Answer: Option B

Explanation: