+0  
 
+2
104
4
avatar+344 

https://vle.mathswatch.co.uk/images/questions/question2801.png

 

smileysmileysmiley

qualitystreet  Feb 13, 2018
 #1
avatar+544 
+2

(i) n(n-1)

    If n-1 is odd, then n is even. 
    n(n-1) is the product of an even number and an odd number, so the product is even.

 

(ii) 2n=2*n Multiplying any whole number by 2 gives an even number, so 2n is an even number. So 2n+1=even number +1=odd number 2n+1 must always be an odd number.

 

 

 

winkwinkwink

lynx7  Feb 13, 2018
edited by lynx7  Feb 13, 2018
edited by lynx7  Feb 13, 2018
 #4
avatar+344 
+1

thanks for helping.

 

smileysmileysmiley

qualitystreet  Feb 14, 2018
 #2
avatar+92629 
0

This was an easy to type qeustion

SO

Next time could you please just type it in!

Melody  Feb 14, 2018
 #3
avatar+344 
+2

sure.

 

smileysmileysmiley

qualitystreet  Feb 14, 2018

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