Question

The sums of arithmetic sequence of 1+2+3+4....+49

Answer 1

1225 is the sum of that arithmetic progression.

Explanation:

Here 'a' is taken as the first term

And 'l' is taken as the last term

Sum of n = n /2 ( a + l)

= 49 /2 ( 1 + 49)

= 49/2 × 50

= 49 x 25

= 1225

Answer 2

I’m sorry but I haven’t learned this. Using what I do know, shouldn’t it be infinity?