Checking Summation results

Suppose we want to check whether our answers for the following is correct:

results

We can use our GC to check as follows:

2a

2b

Since both expressions give the same values, the answer is correct.

How to spot the Cancellation Pattern in Method of Difference

1

Tips: Write the terms using functions. For bottom rows, write from last row and then write the last 2nd row.

Cancellation tip

Challenging Sequences and Series problem 2

seq

seq2