Question

Find the sum of all odd numbers from 50 to 150

Answer 1

O dd numbers between 50 and 150 are 51,53,55,57———-——-up to 149. It is an Ap with n term as 149

because n term is 149=51+(n-1)*2

or (n-1)*2=98

or (n-1)=49 or n=50

because s=n/2{2a +(n-1)d}

we have n=50, d=2

therefore s=50/2{2*51+(50-1)*2}

or s=25{102+98}or s=25*200=5000

(mark me as the brainliest)