Answer: A) 6 Explanation: We know that Sum of Interior angles of Polygon = 180(n-2)Sum of Exterior angles of Polygon = 360so 180(n-2)=2x360Therefore, by solving we get n=6 sides.

Answer: A) 4-15-24 Explanation: In each term second two numbers are multiples of the first number. But in 4-15-24 15 is not multiple of 4.

Answer: C) Antarctica Explanation: Africa - 54 countries South America - 12 countries Antarctica - 0 countries Europe - 43 countries.   Hence, Antarctica continent has the least countries.

Answer: C) Harbajan Singh Explanation:

Answer: D) Only conclusion (i) follows Explanation: Some + All = Some and the common word in two statements is Singers will not be used.

Answer: C) 8 and 1 kmph Explanation: Downstream speed = 72km/8hrs  = 9 kmphupstream speed = 84km/12hrs = 7 kmphspeed of boat = avg of downstream and upstream speedsspeed of boat = (9+7)/2kmph = 8 kmph.current speed = half of the difference of downstream and upstream speedscurrend speed = (9-7)/2kmph = 1 kmph

Answer: D) 1000(p - q) + qr Explanation: We need to find the total cost to send r messsages, r > 1000. The first 1000 messsages will cost Rs.p each (Or)  The total cost of first 1000 messsages = Rs.1000p The remaining (r - 1000) messsages will cost Rs.q each (Or) The cost of the (r - 1000) = Rs.(r - 1000)y   Therefore, total cost = 1000p + rq - 1000q = 1000(p - q) + qr

Answer: D) Mitochondria Explanation: Mitochondria are present in both plant and animal cells.