51 is the input number. If it is not prime, subtract 1 and square it. Does PEMDAS apply to this? If it does then the answer would be 2600

Question

I'm not sure if it's 2600 or 2500

Answer 1

17* 3 = 51

so (51-1)^2 = 50^2 = 2500

Btw, PEDMAS did apply in this rule, just there is hidden brackets that you have to observe in your question.

Answer 2

Since 1 is subtracted before squaring the order of operations would be indicated by:

(51-1)²=2500

Answer 3

2500

---

51 isn't prime because 51 = 17x3

then

(51-1)^2 = 2500

 51 - 1 = 50 and 50^2 = 2500

---

static bool Prime (int a)
{
    for (int n = 2; n <= a / 2; n++)
    {
        if (a % n == 0)
            return false;
    }
    return true;
}

---

int a = 51;

 

if (!Prime(a)) //True

    a = Math.Pow(a -1, 2)

//a == 2500