Question

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

Answer:

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Step-by-step explanation:

∴ required sum =Sn=2n[an+1]=275[1+149]=5625.

Answer 2

Answer:

AP:1,3,5,7..........................149. a=1. d=3-1=5-3=2. an=149. 1+(n-1)2=149. (n-1)2=. n-1=74.