Question

The Sum of 2+3 +4 +....+15 a) 120 b) 125 C) 119 d) 225​

Answer 1

Answer:

C) 119

Step-by-step explanation:

Answer 2

Answer:

Step-by-step explanation:

2 + 3 + 4 + ..... + 15 = ( 1+2+3+...+15)-(1)

Sn = n(n+1)/2, n= 15

Sn = [15(15+1)/2] -1

Sn = [15(16/2)] -1

Sn = (15X8) -1

Sn = 120 - 1

Sn = 119

Hence, answer is (C)119