Question

the value of the submission 18 + summation 19 is​

Answer 1

Answer:

To find:

∑18+∑19=?

Solution:

We know that ∑n= n(n+1)

2

So, ∑18= 18(18+1)

2

∑18=9×19=171

Similarly,

∑19= 19(19+1)

2

∑19=19×10=190

∑18+∑19=171+190=361