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Aptitude · Q221

Average

Competitive Exams · Aptitude · question 221

Q221

The average of odd numbers up to 100 is

A.
49
B.
50.5
C.
50
Answer
D.
100

Answer: Option C

Solution

Answer: Option C
Solution:
Sum of odd numbers upto 100 = 1 + 3 + 5 +.....+ 99
= [2 + (50 - 1) × 2]
= 2500
[ Sum of n terms of an A.P. with first term a and common difference]

∴ Required average
=
= 50