An examination consists of 160 questions. One mark is given for every correct option. If one-fourth mark is deducted for every wrong option and half a mark is deducted for every question that is left, then one person scores 79. And if half a mark is deducted for every wrong option and one-fourth marks are deducted for every question left, then the person scores 76. Find the number of questions he attempted correctly. A. 80 B. 100 C. 120 D. 140

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