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if x,y,z represents consecutive terms in an Arithmetic progression, prove that y is = (x+z)/2

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    State that the difference to be 'b'
    y = x + b
    b = y - x. ..(1)

    z = y + b = x + 2b
    b = (z - x)/2. ..(2)

    Combining equations (1) and (2):
    b = y - x = (z - x)/2
    y = (z + x)/2

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