Question

chapter:ap and gp
Find the sum of the odd numbers between 0 and 50?

Answer 1

Answer:

Hey Hi

AP of odd numbers : 1 , 3 ,5 .... 49

a = 1

n = 25

l = 49

sum = n(a + l)/2

= 25(1+49)/2

= 625

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Rishabh Bansal

Answer 2

Answer:

the odd numbers between 0 and 50 are 1,3,5,7.........49

a=1, d=2

let 49 be nth term

an=a+(n-1)d

49=1+(n-1)2

49-1=(n-1)2

48/2=n-1

n-1=24

n=24+1=25

S25=n/2[a+l]

=25/2[1+49]

=25(50)/2

=25×25

=625