Question

1,3,6,10,15, are called as number​

Answer 1

Answer:

so

what to do?????

乁( •_• )ㄏ

Step-by-step explanation:

Ⓦⓐⓘⓢⓔ Ⓜⓐⓡⓚ Ⓐⓢ Ⓑⓡⓐⓘⓝⓛⓘⓔⓢⓣ

Answer 2

Answer:

triangular number sequence

thank u plz follow me