Answer:
<em>The correct option is: B. 9</em>
Step-by-step explanation:
The number of tennis balls, , in layers of the square pyramid is given by:
As the stack of the tennis balls is in shape of a square pyramid, that means <u>in the top layer, there will be one ball</u>. So,
Now, if then
If then
If then
That means, the number of tennis balls from the top layer will be: 1, 5, 14, 30, .......
So, the number of tennis balls that Coach Kunal could not have is 9.