NIMCET 2009 Question Paper with solutions

Question : 66 of 120

Marks: +1, -0

If all the 6 's are replaced by 9 's, then the algebraic sum of all the numbers from 1 to 100 (both inclusive), varies by

Solution:

In numbers from 1 to 100,6 appears 10 times at unit place and also 10 times at ten's place.
Thus, by replacing 6 by 9 , variation in the sum is

3 × 10+3 × 10 × 10=330

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