Question

Find the sum of the odd numbers between 0 and 50.​

Answer 1

Answer:

625

Step-by-step explanation:

odd no. from 0 start from= 1

then 3----------49

a=1

d=2

Tn=a+(n-1)×d

Tn=1+(n-1)×2

49=1+2n-2

50/2=n

n=25

Sn=n/2[a+l]

S25=25/2[1+49]

S25=25/2×50

S25=25×25

S25=625

Answer 2

The sum of odd numbers between 0 to 50 is
Let the a= 1
d = 2 (as it is odd number)

By the formula:

n/2(2a+ (n- 1) d ) = sum of numbers

Find n first by formula.

an= a + (n-1)d
49 = 1 + (n-1)2
49-1=n-1*2
48/2=n-1
24=n-1
23= n


Now solve
n/2(2a+ (n- 1) d )

23/2(2*1(23-1)2

Now you can solve the question by putting the values.

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