Question

By adding 2 consecutive triangular numbers, we get .

• A. square numbers
• B. cubenumbers
• C. zero

Answer 1

The correct option is A square numbers

Consider the triangular numbers 1,3,6,10...
Adding the consecutive triangular numbers we get,
1+3=4
3+6=9
6+10=16
It is clear that the numbers 4,9,16 are square numbers as,
$2^2$=4
$3^2$=9
$4^2$=16