A students's average in first five semesters is 67. He is eligible for placements if his overall average after 6 semesters is at least 70. How much should he score in his sixth semester to be eligible for placements.
Correct!
Wrong!

If f(1)=1 & f(m+n) = f(m) + f(n) + 3(mn), for all natural numbers m and n. What is the value of f(9)?
Correct!
Wrong!

A number plate can be made with 2 alphabets followed by 2 digits with no repetition. Find the number of such plates that can be made.
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