[求助]求助一道数学JJ

baby11

28.The consecutive integer between 1-100 inclusive, while X=n(n+1),what's the

possibility of x in the sequence? A)1/4 B) 2/3 C)1/2 D)3/4 E)记不清了 只记得正确的选项了 1/2

baby11

who can help me??