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. If the average of a,b,c be M and ab + be =-ca, then the average of a, b,c is (A) M (B) 3M (C) 9M (D) 27M
Answers
Answered by
0
Answer:
Given,
3
a+b+c
=M⇒a+b+c=3M
Now, (a+b+c)
2
=a
2
+b
2
+c
2
+2(ab+bc+ca)
⇒(3M)
2
=a
2
+b
2
+c
2
+0⇒a
2
+b
2
+c
2
=9M
2
Average of a
2
,b
2
,c
2
=
3
a
2
+b
2
+c
2
=
3
9M
2
=3M
Step-by-step explanation:
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Answered by
0
Answer:
A
Step-by-step explanation:
because it is given that te average of a, b, c is M
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