Question

Find the sum of odd numbers between 0 and 50

Answer 1

Answer:

625

Step-by-step explanation:

The odd numbers between 0 and 50 are 1,3,5,7,9…49

Therefore, it can be observed that these odd numbers are in an A.P.

a=1,d=2,l=49

l=a+(n−1)d

49=1+(n−1)2

48=2(n−1)

n−1=24

n=25

S

n

=

2

n

(a+l)

S

25

=

2

25

(1+49)

=

2

25×50

=625

Answer 2

we know that

Sum of n terms formula (ʂŋ)=

$sn = \frac{n}{2} (a + (n - 1)d) \\ \\sn = \frac{26}{2} (1 + (26 - 1) - 1 \\sn = 13( - 26) =33 8$

hope it helps u✔✔