ANSWER:
Jarnel can wear six different outfits.
SOLUTION:
Given, Jarnel has a blue shirt, a yellow shirt, a green shirt, and a pair of jeans.
We need to find how many different outfits can jarnel wear.
In general, we wear one shirt and one pant.
Here, jarnel has 3 options for wearing a shirt and 2 options for wearing pants.
So, let us conclude the answer step by step
If he wears blue shirt :
he still has 2 ways as he has 2 pants, so he has 2 different outfits with blue shirt.
If he wears yellow shirt:
he still has 2 ways as he has 2 pants, so he has 2 more different outfits with yellow shirt.
If he wears green shirt:
he still has 2 ways as he has 2 pants, so he has 2 more different outfits with green shirt.
He has no more ways , so in total he has 6 different outfits