(36785)^2350 +(96387)^350
What is the Unit Digit in the above mentioned expression ?

 Posted by Hariboopal on 2/23/2011 | Category: Aptitute Test Interview questions | Views: 3067 | Points: 40
Answer:

short cut:

1st portion:untit digit=>
5^2350 only considered power number:(2350-1)/4=remainder 1
5^1+remainder=5^1+1=5^2=25
so unit digit =>5

2nd portion :unit digit=>
7^350 only considered power number:(350-1)/4=remainder 1
7^1+remainder=7^1+17^2=49
so unit digit=>9

Answer=1st portion unit digit+2nd portion Unit Digit
==> 5+9=14

Answer is 4

(Important:(Any Power number-1)/4)


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Comments or Responses

Posted by: Kishork80 on: 2/23/2011 | Points: 10
LOOKS NRE LIKE MATEMATICS PUZZLE ... NOT IN .NET

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