CTS Company Logical Reasoning Cryptography

The puzzle is
there are three type of boxes: gold,silver,lead,
gold says, " ring is not in silver,
Silver says ,"ring is not here,
lead says," ring is here"
Question is where is the ring?
which one says true and false?

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CTS Other Question

If Poonam wears Purple then Kunal wears Maroon. If Poonam sits in Cabin1 or cabin3, then Kunal sits in cabin2. If Rajesh wears Blue then Rashmi wears Yellow. If the person who wears Blue sits in cabin2 then the person who wears yellow sits in cabin3. If Rajesh doesn't wear blue then Kunal wears blue. If Rashmi wears yellow then Poonam sits in cabin1 or cabin4. If the person who wears maroon sits in cabin2 then the person who wears purple sits in cabin3. If the person who wears purple sits in cabin2 then rashmi sits in cabin4. Kunal doesn't wear blue. If a2 + b2 + c2 = 250 and ab + bc + ca = 3, then a + b + c is