CAT 2023 Number System — Previous Year Question
Year
CAT 2023
Section
Quantitative
Topic
Number System
Difficulty
Medium
Question
Slot-1
Suppose Haruka has a special key Δ in her calculator called delta key: Rule 1: If the display shows a one-digit number, pressing delta key Δ replaces the displayed number with twice its value. Rule 2: If the display shows a two-digit number, pressing delta key Δ replaces the displayed number with the number equal to the sum of its digits. Suppose Haruka enters the value 1 and then presses delta key Δ repeatedly. After pressing the key for 68 times, what will be the displayed number?
7
4
10
2
8
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