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Blazing goIITian

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28 Apr 2012 14:58:58 IST

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ALGEBRA

Engineering Entrance , JEE Main , JEE Advanced , Mathematics , Algebra

find the units digit of 248^75

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KAREENA

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28 Apr 2012 15:55:48 IST

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PLEASE HELPPPPPPP

GOPAKUMAR

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28 Apr 2012 16:26:48 IST

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KAREENA

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28 Apr 2012 17:39:44 IST

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how 2?

GOPAKUMAR

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28 Apr 2012 17:45:56 IST

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248 = 2³ * 31 => NOW 248⁷⁵ = 2²²⁵ * (30+1)⁷⁵

Now (30+1)⁷⁵ ends with 1 (using binomial) and 2²²⁵ ends with 2 (since after 4 powers of 2 the units place repeat i.e 2² =4 2³ =8 ,2⁴ =16 , 2⁵ =32 and so on,...)

therfore there product ends with 2

KAREENA

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28 Apr 2012 17:50:04 IST

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THANKSSS

GOPAKUMAR

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28 Apr 2012 17:51:34 IST

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pls rate

KAREENA

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28 Apr 2012 17:54:32 IST

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HOW TO RATE?????

GOPAKUMAR

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28 Apr 2012 17:57:08 IST

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click on this(see image below) above my post to post to rate

aravindreddy

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29 Apr 2012 10:48:16 IST

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ALGEBRA

aravindreddy

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29 Apr 2012 10:48:17 IST

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ALGEBRA

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