1.

यदि `a/(q-r)+b/(r-p)-c/(p-q)` तो `pa+qb+rc` का मान क्या होगा?

Answer» Correct Answer - A
Let `a/(q-r)=b/(r-p)=c/(p-q)=k`
`q/(q-r)=k` (on multiplying by `P`)
`pa=k(pq=pr)`………….i
In the same way we can write
`qb=k(qr-qp)`………….ii
and `fc=k(rp-rq)`……………iii
on adding eq i, ii and iii
`pa+qb+rc=k(p-pr+qr-qp+rp-rq)`
`pa+qb+rc=0`


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