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Question

By adding 2 consecutive triangular numbers, we get  .
  1. square numbers
  2. cubenumbers
  3. zero


Solution

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,
22=4
32=9
42=16

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