SEAMO 2027 - Paper C - SET 03 - Self-study Question 25

Study the pattern: $1=1=1\times1$; $1+3=4=2\times2$; $1+3+5=9=3\times3$; $1+3+5+7=16=4\times4$; and so on. Find the largest $n$ for which $1+3+5+\cdots+n<300$.