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Option 1: Arabic - Arabic is one of the official languages of the United Nations. It is used in various official documents and meetings within the organization.
Option 2: Spanish - Spanish is another official language of the United Nations. It is used widely in the organization for communication and documentation purposes.
Option 3: Hindi - Hindi is NOT one of the official languages of the United Nations. The official languages of the United Nations are Arabic, Chinese, English, French, Russian, and Spanish. Hindi is widely spoken in India and is one of the most widely spoken languages in the world, but it is not recognized as an official language of the United Nations.
Option 4: Russian - Russian is one of the official languages of the United Nations. It is widely used in various official capacities within the organization.
In conclusion, the correct answer is Option 3: Hindi, as it is not one of the official languages of the United Nations.