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Byju's Answer
Standard XI
Mathematics
Harmonic Mean
If 8x + 4, 6x...
Question
If (8x + 4), (6x - 2) and (2x + 7) are in A.P. then the value of x should be
.
A
7.5
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B
10
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C
15
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Solution
The correct option is
A
7.5
If a,b,c are in A.P
b=(a+c)/2
According to question 8x+4,6x-2,2x+7 are in A.P
6x-2=(8x+4+2x+7)/2
6x-2=10x+11/2
2(6x-2)=10x+11
12x-4=10x+11
12x-10x=11+4
2x=15
x=15/2=7.5
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