Stars from 3 to 4 magnitude in the sky are about 400, and from 4 to 5 – about 1100. Which of them together brighten the Earth?

The stars of the 1st group are, on average, 1 magnitude brighter than the stars of the second, that is, 2.512 times. Since 2.512 * 400> 1100, the total brightness of the stars of the first group is higher.

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