What is the average of odd numbers from 1 to 40?
সমাধান
সঠিক উত্তর: Option A
sum of odd numbers from 1 to 40= 1 + 3 + 5 + ... + 39
= 20 (1 + 39)/2
= 20 × 40/2
= 400
Average = 400/20
= 20
= 20 (1 + 39)/2
= 20 × 40/2
= 400
Average = 400/20
= 20