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The p^(t h),q^(t h)and r^(t h)terms of ...

The `p^(t h),q^(t h)`and `r^(t h)`terms of an A.P. are a, b, c, respectively. Show that `(q-r)a+(r-p)b+(p-q)c=0`.

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Let `a="First term of the AP"` and
`d="common difference of the AP"`
Now, `a=A+(p-1)d`.........(1)
`b=A+(q-1)d`.........(2)
...
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