Hard Question

Peter has a robot.If he press 'A' button of the robot,the robot moves 1 step forward.If he press 'B' button of the robot,the robot moves 2 steps forward.If he press 'C button of the robot, the robot moves forward 3 steps.If he press the 'D button of the robot, the robot moves 4 steps forward

a)If he wants the robot to move 10 steps forward,how many ways can the robot move?

b)If he wants the robot to move 15 steps forward,how many ways can the robot move?

Medium Question

The sum of two prime numbers is 1999.Find the product of these two numbers.

Easy Question

The product of three consecutive natural numbers is 1716.Find the numbers.

Hard Question

1^3+2^3+3^3+4^3+5^3+6^3......100^3

*e.g.   1^3=1 , 2^3=8 , 3^3=27 , 4^3=64

Medium Question

1x2x3x4x5x6x7x8x9x10x11x12......x100 has how many zeros?

Easy Question

1+2+3+4+5+6+7+8+9+10+11......+12400=

Questions are on every weekend

Question are usually on weekends because i have not much question.And i will post questions until Term 1 finish.