Question

Write the short form of the expansion in symbolic form 1 + 2 + 3 + 4 + ……………….+ n​

Answer 1

Answer:

[n(n+1)]/2

Step-by-step explanation:

Answer 2

Answer:

10+n

Step-by-step explanation:

we should add 4 3 2 1 and n

4+3+2+1+n =10+n