Engg. & Math Insights

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Engg. & Math Insights

You get chocolates in factorial numbers: 2! from the first friend, 3! from the second, 6! from the third.
What is the last digit of the chocolates you have?

2 months ago | [YT] | 0

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Engg. & Math Insights

If bus seats are arranged in factorial rows, and the bus has 3! + 4! + 15! rows, what will be the last digit of the total rows?

2 months ago | [YT] | 1

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Engg. & Math Insights

You are saving money in factorial amounts daily: Day 1 → 1!, Day 2 → 2!, Day 3 → 3!, … up to Day 10 → 10!.
What is the last digit of your total savings?

2 months ago | [YT] | 0

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Engg. & Math Insights

A clock counts time in factorial minutes. After 4! + 5! minutes, where will the minute hand point?

2 months ago | [YT] | 1

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Engg. & Math Insights

A baker stacks trays in factorial order. By the time he reaches the 6th tray, what will be the last digit of the total trays stacked?

2 months ago | [YT] | 0

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Engg. & Math Insights

What is the unit digit of 1! +2! +3! +....+ 600!

2 months ago | [YT] | 1

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Engg. & Math Insights

What's the unit digit of 129 + 6! ?

2 months ago | [YT] | 0

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Engg. & Math Insights

What is the unit digit of 7!?

2 months ago | [YT] | 2

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Engg. & Math Insights

What is the unit digit of 7^18 - 2^61?

4 months ago | [YT] | 2

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Engg. & Math Insights

A smart lock creates a PIN by calculating 2^12 × 3^7, then taking only the last digit of that result. If the door opens only when the digit is odd, will the door open?

5 months ago | [YT] | 1

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