यदि m – n = 11, और m2+ n2 = 141, तो mn का मान ज्ञात कीजिए|

Option
a) 10
b) 15
c) 27
d) 23

Solution :

(m-n)^2 = m^2 + n^2 - 2mn
(11)^2 = 141 - 2mn
2 mn = 141 - 121 = 20
mn =\frac {20}{2}= 10
mn = 10

Ans : a) 10

Related Posts

Scroll to Top