Question

Is ans ka reason bta skte ho kya koi intelligent hai to

Answer 1

234:579

2+3 ===》5

3+4 ===》7

4+5 ===》9

Each number of 234 is added with its consecutive number to get 579.

321:?

3+4 ===》7

2+3 ===》5

1+2 ===》3

321:753

753 is the answer