Implications watch

1. Please can someone explain to me why the following statements are true or false?

i) n = 2 only if n^2 - n - 2 = 0. TRUE
ii) n = 2 if n^2 - n - 2 = 0. FALSE
iv) n =2 is necessary for n^2 - n - 2 = 0. FALSE
viii) n^2 - n - 2 = 0 <= (n = 2 or n = -1). TRUE
ix) (n^2 - n - 2 = 0 => n = 2) or (n^2 - n -2 = 0 => n = -1). FALSE
x) (n^2 - n - 2 = 0 <= n = 2) or (n^2 - n - 2 = 0 <= n = -1). TRUE
xi) (n^2 - n - 2 = 0 <= n = 2) and (n^2 - n - 2 = 0 <= n = -1). TRUE

Thank you.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 10, 2017
Today on TSR

Congratulations to Harry and Meghan!

But did you bother to watch?

Why are girls so attracted to tall guys?

Poll

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE