3 x17 is 51
51 is not a Prime number it is composite.
use this rule :
You wil know a number is divisible by 3 if you add up the digits. if the sum is a multiple of 3 then that number is divisible by 3.
i.e.: 51 5+1 =6
6 is divisible by 3 so 51 is divisible by 3.
51/3= 17
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Well, darling, 17 multiplied by 3 is 51. It's as simple as that. No need for a drumroll or confetti, just plain old multiplication. Hope that clears things up for you!
The product of 17 multiplied by 3 is 51. This can be calculated by adding 17 three times, or by using the multiplication operation to find the result. In mathematical terms, 17 x 3 = 51.
9/17 ÷ 3/34 = 9/17 x 34/3 = (9 x 34)/(3 x 17) = 9/3 x 34/17 = 3 x 2 = 6
2 x 3 x 3 x 3 x 17
x+3 = 20 x = 20-3 x = 17
x/3 + 12 = 29 x/3 = 29-12 = 17 x = 17 times 3 = 51
A n sided figure has 1/2 n(n - 3) diagonals → a 17-gon has 1/2 x 17 x (17 - 3) = 1/2 x 17 x 14 = 119 diagonals