QUANT 4-PACK SERIES Problem Solving Pack 4 Question 2 For every positive integer n...
For every positive integer n that is greater than 1, the function s(n) is defined to be the sum of all of the odd integers from 1 to n, inclusive. The s(n) could have any of the following units digits except…?
Choose one
A) 1	B) 2	C) 4	D) 6	E) 9
For every positive integer n that is greater than 1, the function s(n) is defined to be the sum of all of the odd integers from 1 to n, inclusive. The s(n) could have any of the following units digits except…?   Used brute force on this one to calculate. Not sure if there is a quicker way.   1+3= 
<gadget id="calculator">1+3</gadget>
<output>4</output>
4 C is out   1+3+....15= 81 A is out   1+3+5+7= 
<gadget id="calculator">1+3+5+7</gadget>
<output>16</output>
16 D is out   1+3+5= 
<gadget id="calculator">1+3+5</gadget>
<output>9</output>
9 E i out   Answer: 2
<result>B</result>
QUANT 4-PACK SERIES Problem Solving Pack 4 Question 2 For every positive integer n...
For every positive integer n that is greater than 1, the function s(n) is defined to be the sum of all of the odd integers from 1 to n, inclusive. The s(n) could have any of the following units digits except…?