In an entrance test, there are multiple choice questions. There are four possible answers in each question, of which one is correct. The probability that a student knows the answer to a question is 910 . If he gets the correct answer to a question, then what is the probability that he was guessing? (a). 3740 (b). 137 (c). 3637 (d). 19

How do you find the Maclaurin series for tanx?

Why is Axiom 5, in the list of Euclid’s axioms, considered a ‘universal truth’? (Note that the equation is not about the fifth postulate.)

The smallest composite number is ______.

(a) 2

(b) 4

(c) 1

(d) None of these

Find the arithmetic mean of the first ten odd natural numbers.

A boat goes 24 km upstream and 28 km downstream in 6 hours. It goes 30 km upstream and 21 km downstream in 6 hours and 30 minutes. The speed of the boat in still water is

A. 10 km/hr

B. 4 km/hr

C. 14 km/hr

D. 6 km/hr