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    				| 1. | In the expansion of 311 the units digit is …………….. A) 3 B) 7 C) 10D) 16 | 
| Answer» Correct option is B) 7 Correct option is (B) 7 \(\because3^4=3^2\times3^2=9\times9=81\) Unit's digit in \(3^4\) = 1 \(\therefore\) Unit digit's in \(3^{11}=3^4\times3^4\times3^3\) \(=1\times1\times7=7\) \((\because\) Unit's digit in \(3^4\) = 1 & unit's digit in \(3^3\) = 7 \((\because3^3=27))\) | |