1.

alpha, beta, gamma, delta are angles in I, II, III and IV quadrant respectively and no one of them is an integral multiple of pi//2. They form an increasing arithmetic progression.If alpha+beta+gamma+delta=theta and alpha=70^(@)

Answer»

`400^(@) lt THETA lt 580^(@)`
`470^(@) lt theta lt 650^(@)`
`680^(@) lt theta lt 860^(@)`
`540^(@) lt theta lt 900^(@)`

Answer :C


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