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Question
Q.9
Sum
Solution
12, a+b and 2a are in AP.
`⇒ a+b=(12+2a)/2`
`⇒a+b=6+a`
`⇒b=6`
And ,
a+b, 2a and b are in A.P.
`⇒2a=(a+b+b)/2`
`⇒4a=a+2b`
`⇒3a=2b`
`⇒ a=(2b)/3`
`⇒a=(2xx6)/3=4`
Hence, `a=4 and b=6`
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Simple Applications of Arithmetic Progression
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