Question

1+3+5+7+9..........+159​

Answer 1

Answer:

Good Question

Step-by-step explanation:

1+3+5+7+9+11+13+.............+159=??????

Answer 2

Answer:

6400

Step-by-step explanation:

We have to find sum

First we find total number of terms

An = 159

An = a1 + ( n - 1) d

159 = 1 + ( n - 1) 2

159 - 1 = (n - 1) 2

158 = 2 ( n - 1)

79 +1 = n

N = 80

Now sum

Sn = n/2 ( 2a1 + (n-1)d)

S80 = 40 ( 2 (1) + 79 (2))

S80 = 6400