Question

Find the sum of all odd numbers between 0 and 50?​

Answer 1

Step-by-step explanation:

50/2 = 25 odd nos. are between 0 and 50

sum of 25 consecutive odd nos will be equal to 25^2 = 25×25= 625

Answer 2

Answer:

a + ( n - 1) d = an

=> 1 + ( n - 1) 2 = 49

=> ( n - 1) 2 = 48

=> ( n - 1) = 24

=> n = 25.

So,

Sn = n/2 × ( a +l)

= 25 /2× ( 1 +49)

= 25 /2 × 50

= 25 ×25

= 62