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If the pth term of an A.P. is q and the ...

If the pth term of an A.P. is q and the qth term isp, then find its rth term.

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The correct Answer is:
p+q-r
a+(p-1)d=q and a+(q-1)d=p
`rArr(p-q)d=q-p`
`rArr d=-1`
`T_(r)=a+(r-1)d=a+(p-1)d+(r-p)d`
`=q-(r-p)=p+q-r`
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