Question

Find a and b, such that 12, a + b, 2a, b are in A.P.​

Answer 1

a+b-12 = b-2a

⇒3a = 12

⇒a=4

also, a+b-12= 2a-(a+b)

⇒ b-8=4-b

⇒ 2b=12

⇒ b=6

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