Question

1) If m +n = √17 and m-n = √5 then the value of mn is
a) 22 b)11 c)6 d)3
2)If the data in the ascending order is 10, 20, 30, X + 1, X + 3, 60, 70, 80 and the median of the data is 50 find the value of mn is a)40 b)50 c)48 d)52
3) If the ratio of the curved surface area of two solid spheres is 16:9 the ratio of their volume is a)64:27 b)4:3 c)27:64 d)3:4​

Answer 1

Answer:

1. option d

2. option c

3. option a

hope it helps you::)

Answer 2

Answer:

1) 3

Step-by-step explanation:

(m+n)²= m²+n²+2mn =17 .......(1)

(m-n)²=m²+n²-2mn =5 ..........(2)

then (1)-(2),

(m²+n²+2mn)-(m²+n²-2mn) = 17-5

or, 4mn = 12

or, mn = 12/4

= 3