Alex starts skip counting at 13 and writes 100 numbers. The 25th number he writes after writing 13 is 88. How many odd numbers does Alex write?
1 Answer
Mar 27, 2018
50
Explanation:
We are creating an algebraic series, i.e. picking numbers that are are constant steps away from each other.
If at 25 steps, we have jumped
That means that 50 of the numbers written down are odd and 50 are even.