Question

Find the sum of the G.P,1+2+3+...+45

Answer 1

hello :

note : 1+2+3+.......+n = n(n+1)/2

Explanation:

in this exercice : n = 45

1+2+3+...+45 = 45×46/2 = 1035

Answer 2

Answer: 1035

Explanation:

`\sum^(45)_(1)i\\\\\text{The sum of an arithmetic sequence is:}\ (a_1+a_n)/(2)\cdot n\\\\= (1+45)/(2)\cdot 45\\\\\\=(46)/(2)\cdot 45\\\\\\=23\cdot 45\\\\=1035`