Discuss Forum
1.
- A. 20
- B. 20
- C. 20
- D. 20
Answer: Option C
Explanation:
দেয়া আছে,
a + b = 10_________(i)
a - b = 6 _________(ii)
(i) ও (ii) যোগ করে পাই,
(a + b) + (a - b ) = 10 + 6
2a = 16
∴ a = 8
(i) ও (ii) বিয়োগ করে পাই,
(a + b) - (a - b ) = 10 - 6
a + b – a + b = 10 + 6
2b = 4
∴ b = 2
সুতরাং, ab = 8×2 = 16
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