Math
posted by Joyce on .
What is the sum of the first 40 consecutive odd numbers?

1 + 3 + 5 +........2n1....
1st term = 1
40th term = 2*401 = 79
arith metic progression
s = n/2(a1+an)
= 40/2(1+79) = 1600
posted by Joyce on .
What is the sum of the first 40 consecutive odd numbers?
1 + 3 + 5 +........2n1....
1st term = 1
40th term = 2*401 = 79
arith metic progression
s = n/2(a1+an)
= 40/2(1+79) = 1600