Question

find the sum of all odd numbers from 1 to 150

Answer 1

⭕Sum of odd numbers = n²

n = number of terms

➡Here, n = 150
n² = 150² = 22,500

Answer 2

Answer:

Step-by-step explanation:

Required AP:-1,3,5,.....,149

a=1 ,l=149 and d=2

since, l=a+(n-1)d

Hence,149=1+(n-1)×2

=(n-1)=149-1/2

=(n-1)=148/2

=n=74+1

Hence,n=75

Now,(Sn=n/2 +(a+l))

-› S75=75/2 +(1 + 149)

S75=75×150/2

=75×75

=5625

...hope it will help...