Did Prem (Anil Kapoor) do that only because of his ego as he wanted only himself to be the person who made it big from the slums?
And didn't want Jamaal to share this fame with him?
Or he didn't want the show to lose such a large sum of money?
Or he had both the reasons to give Jamaal the wrong answer?
In the real show Kaun Banega Crorepati, I always see Amitabh trying his best to get the contestants win the maximum amount of money possible, by asking the contestants again and again to consider their final answer if they are about to give a wrong answer.
And if the answer is correct, he immediately locks it. So it never seems like the show makers care about losing large amount of money.
If they don't wanta contestant to win large sum of money, they do it more subtly by asking really tough questions.
So it seems like Prem gave the wrong answer because he personally didn't want Jamaal to win.
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