Question

Find the sum of all odd numbers from 1 to 150.

Answer 1

odd numbers from 1 to 150 are

1,3,5,7......,150.

This is an A,.P. with a=1,d=2,n=150

sn=n(2a+(n-1)d)/2

s150=150/2{2×1+(150-1)×2}

s150=75×{2+149×2}

s150=75×{2+298}

s150=75×300

s150=22500

Therefore,the sum of all odd numbers from 1 to 150 is 22,500.

Hope it helps u ^_^ ^_^ ^_^

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Answer 2

Answer:

n is 75

Sn is 5625

(see attachment for full answer)

hope it helps you

@ana205