1.

For 4 le r le n ((n),(r))+4((n),(r+1))+6((n),(r+2))=4((n),(r+3))+((n),(r+4)) equals

Answer»

`((n+4),(R+4))`
`((n+4),(r))`
`((n+3),(r-1))`
`((n+4),(r+3))`

ANSWER :A


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