a+b=10 এবং a-b=6 হলে ab = কত?
A
20
B
18
C
16
D
12
Correct Answer: 16
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 Normal 0 false false false EN - US X - NONE X - NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso - style - name:"Table Normal"; mso - tstyle - rowband - size:0; mso - tstyle - colband - size:0; mso - style - noshow:yes; mso - style - priority:99; mso - style - qformat:yes; mso - style - parent:""; mso - padding - alt:0in 5.4pt 0in 5.4pt; mso - para - margin - top:0in; mso - para - margin - right:0in; mso - para - margin - bottom:10.0pt; mso - para - margin - left:0in; line - height:115%; mso - pagination:widow - orphan; font - size:11.0pt; font - family:"Calibri", "sans - serif"; mso - ascii - font - family:Calibri; mso - ascii - theme - font:minor - latin; mso - hansi - font - family:Calibri; mso - hansi - theme - font:minor - latin; mso - bidi - font - family:"Times New Roman"; mso - bidi - theme - font:minor - bidi;}