Question

odd man out : INSAT,GSAT,IRS,PSLV .​

Answer 1

IRS

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Answer 2

IRS is the odd one out.

With 11 operational satellites, the IRS system is the world's largest constellation of remote sensing satellites for civilian purposes in service today. All of these are in polar Sun-synchronous orbit and give data at various spatial, spectral, and temporal resolutions.