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Bittrex is good, as mentioned, but you need another exchange to send your euro for buying some bitcoins first. Then you can send these bitcoins for example to Bittrex and/or Bitfinex.
For buying bitcoins I wouldn't use bitcoin.de as they don't protect your data well (they cooperate with German authorities even if there is no judical decision, yet). Therefore you may use Bitstamp instead.

yes, sir, i am from India. IN INDIA UNOCOIN IS SELLING BTC IN EXCHANGE OF RUPEES (INDIAN CURRENCY)
AND WORLD WIDE COINBASE IS SELLING BTC ACCEPTING USD AND EURO AS A PAYMENT.

Bittrex is a good exchanger and coinpayment is a nice wallet.other good wallet coinbase and blockchain.exchanger polinex nova

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