Digit Sum

Algebra Level pending

Given that the sum of the digits of 2 2011 { 2 }^{ 2011 } is 2738 2738 . Compute the sum of the digits of 2 2012 + 2 2014 { 2 }^{ 2012 }+{ 2 }^{ 2014 } .


The answer is 2738.

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1 solution

William Isoroku
Dec 10, 2014

2 2012 + 2 2014 { 2 }^{ 2012 }+{ 2 }^{ 2014 } can be factored as 2 2012 ( 1 + 2 2 ) { 2 }^{ 2012 }(1+ { 2 }^{ 2 }) which equals to 2 2012 5 { 2 }^{ 2012 }\cdot 5 .

Factor again would give us: 2 2012 5 = 2 2011 2 5 = 2 2011 10 { 2 }^{ 2012 }\cdot 5={ 2 }^{ 2011 }\cdot 2\cdot 5={ 2 }^{ 2011 }\cdot 10

We already know the digit sum of 2 2011 { 2 }^{ 2011 } . If that digit sum is multiplied by 10 10 , it would be the same digits with an extra 0 0 in the one's place. So the digit sum would be 2738 + 0 = 2738 2738+0=\boxed {2738}

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