To determine which numbers are divisible by 3 among the given options, we need to check if each number is divisible by 3 without leaving a remainder.
Let's examine each option:
a. 551: To check if 551 is divisible by 3, we can add up its digits: 5 + 5 + 1 = 11. Since 11 is not divisible by 3, 551 is not divisible by 3.
b. 461: Adding up the digits of 461: 4 + 6 + 1 = 11. Similarly, since 11 is not divisible by 3, 461 is not divisible by 3.
c. 816: Summing up the digits of 816: 8 + 1 + 6 = 15. Since 15 is divisible by 3 (15 ÷ 3 = 5), 816 is divisible by 3.
d. None of these: Since options a and b are not divisible by 3, and option c (816) is divisible by 3, the correct answer is "d. none of these."
Therefore, among the given options, only the number 816 is divisible by 3.
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