NIFT UG 2014 Question Paper with solutions

Question : 77 of 150

Marks: +1, -0

Find the average of first 20 multiples of 7.

Solution:

Average

={7+14+21+...+140}/20

=20/2[{2×7+(20-1)7}/20]

=10[{14+133}/20]=147/2=73.5

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