RRB Non Technical Model Papers 8 with solutions

Question : 93 of 100

Marks: +1, -0

The average of 6, 12, 18, … 120 is

Solution:

(3) Sum of

6, 12, 18, ….. , 120

= 6 (1+2+3+…..+20)

Sum

=6×{20(20+ 1)}/2

Average

={6 ×20(20 +1)}/{20× 2}= 63

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