You must be logged in to see worked solutions.

Already have an account? Log in here.

These problems and puzzles will put your deductive reasoning ability to the test and reinforce your mathematical skills. See more

How many circles are in the final group?

You must be logged in to see worked solutions.

Already have an account? Log in here.

Using the pattern above as an aid, evaluate the sum:

\[ 1 + 2 + 3 + 4 + 5 + 4 + 3 + 2 + 1 \]

You must be logged in to see worked solutions.

Already have an account? Log in here.

Based on the previous question, evaluate:

\[ 1 + 2 + 3 + \dots + 8 + 9 + 8 + \dots + 3 + 2 + 1. \]

You must be logged in to see worked solutions.

Already have an account? Log in here.

From what you have learnt, which expression represents the sum

\[ 1 + 2 + 3 + \dots + (n-1) + n + (n-1) + \dots + 3 + 2 + 1 ? \]

You must be logged in to see worked solutions.

Already have an account? Log in here.

Hence or otherwise, what is the value of the expression:

\[ 1 + 2 + 3 + \dots + 49 + 50 + 49 + \dots + 3 + 2 + 1? \]

You must be logged in to see worked solutions.

Already have an account? Log in here.

×

Problem Loading...

Note Loading...

Set Loading...