Finding Molarity of final mixture

Can someone help me in finding out the right answer. 25ml of 3.0 MHNO₃ are mixed with 75ml of 4.0 MHNO₃. If the volumes are adding up the molarnity of the final mixture would be: (a) 3.25M (b) 4.0M (c) 3.75M (d) 3.50M

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