Indian Institute of Foreign Trade 2017 Solved Paper

Question : 66 of 114

Marks: +1, -0

10^67 – \; 87

is written as an integer in base 10 notation, what is the sum of digits in that integer?

Solution:

Choice (D) Let us write expanded form of the number

10 ^ { 67 } - 87 = 10 ^ { 67 } - 1 - 86 =

999999999....(67 times)

- 86

= 99999999(65 times)13
Sum of the digits

= 9×65 + 1 + 3 = 589.

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