ABC26GN0035 · Number System

Subject: General Aptitude · Chapter: Number System · Exam: · Marks: · Difficulty:

Find the unit's digit in the product $(2467)^{153} imes (341)^{72}$.
Answer
Answer (as printed):
Explanation
Clearly, unit's digit in the given product = unit's digit in 7153 × 172. 162 × Now, 74 gives unit digit 1. \ 7152 gives unit digit 1. \ 7153 gives unit digit (1 × 7) = 7. Also, 172 gives unit digit 1. Hence, unit digit in the product = (7 × 1) = 7.

Explanation as extracted from the printed page; notation may be imperfect.

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