The answer is not 50, it is 7 * 6 * 5 * 4 * 3 * 2 * 1 = 5040.

Why it is not 50?

Because he can type 7 words in 1 minute, he can type 6 words in 1 minute, etc.

The total time is 7 minutes, and in 1 minute he can type 7 words. So in 1 minute he can type 7 * 6 * 5 * 4 * 3 * 2 * 1 = 5040 words.

Answer:

m⃠A⃠K⃠I⃠D⃠I⃠B⃠S⃠J⃠D⃠U⃠Q⃠