Cnn section quiz doubt

Please give me the explanation of the answers of these questions sir

  1. 30 filters of size 3x3 are applied on a feature map of shape 300 * 300 * 10, with stride 2? What is the shape of the output? answer:149 * 149 * 30

  2. A 5x5 filter is applied on an RGB image of size 1028x1028, with stride of 1 and no padding. What is the shape of the output? answer: 1024 * 1024

  3. A 1080 * 1080 black and white image also includes data from a UV channel. The shape of the image will be> answer:108010802