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The unit’s digit in the product 771 × 663 × 365 is
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- 1
- 2
- 3
- 4
Correct Option: D
71 = 7,
72 = 49,
73 = 343,
74 = 2401
31 = 3,
32 = 9,
33 = 27,
34 = 81
i.e. the digit at unit’s place gets repeated after power 4. Unit 6 remains same for any power.
∴ Required unit’s digit
= Unit’s digit in the product of 73 × 6 × 1 = 4
