Consider the three numbers 15, 36 and 39. Which of the following statements about them is correct?
a) They form a Pythagorean triple and the triple is primitive.
b) They do not form a Pythagorean triple because 152+362=392.},{
c) They form a Pythagorean triple but the triple is not primitive.
d) They do not form a triple as at least one number must be even.