Question

find the Sum of odd numbers b/w 0and 50

Answer 1

Heya !!!

AP = 1 , 3 , 5 ........ 49

Here,

First term (A) = 1

Common difference (D) = 3-1 = 2

Tn = 49

A + (N-1) × D = 49

1 + (N-1) × 2 = 49

1 + 2N -2 = 49

2N -1 = 49

2N = 49+1

N = 50/2

N = 25

Therefore,

Sn = 25/2 × [ 2A + (N-1) × D ]

S24 = 25/2 × [ 2 × 1 + (25-1) × 2 ]

=> 25/2× (2 + 48)

=> 25/2 × 50

=> 25 × 25

=> 625

Hence,

Sum of odd numbers between 0 and 50 is 625

HOPE IT WILL HELP YOU..... :-)

Answer 2

Heya !!!

Here is Your Answer.

To obtain :
Sum of odd numbers between 0 and 50.

Here,
a = 1
d = 3-1 = 5-3 = 2
n = 25
l = 49

Using ...
Sn = n/2 (a+l)
= 25/2 × (1+49)
= 25/2 × 50
= 25 × 25
= 625.

Hence, the sum of all odd numbers between 0 and 49 is 625.

Hope It Helps