MBA Exam

What is the mean of a^2, b^2 , c^2 .... If the mean of a,b,c is M and ab+bc+ca= 0

1) M^2
2) 3M^2
3) 6M^2
4) 9*M^2

Read Solution (Total 1)

2) 3M^2

(a + b + c)^2 = a^2 + b^2 + c^2 + 2(ab + bc + ca)
=> (3M)^2 = (a^2 + b^2 + c^2
=> (a^2 + b^2 + c^2)/3 = 3M^2
11 years agoHelpfull: Yes(0) No(0)

MBA Other Question

In ∆ABC, D is the midpoint of AC and E is the mid point of DC. BD and BE are joined. Point F divides BD in the ratio 1 : 2 and G divides EB in the ratio 1 : 2. What is the ratio of the area of (∆AFG + ∆BFG) to the area of ∆ABC?

1) 1 : 3
2) 1 : 4
3) 1 : 2
4) 3 : 2
The diluted wine contains only 8L of wine and the rest is water. A new mixture whose concentration is 30% is to be formed by replacing wine. How many Liters of mixture shall be replaced with pure wine if there was initially 32L of water in mixture?(Post approach also)

1) 5
2) 4
3) 6
4) 2