exam Maths Puzzle Numerical Ability

Express the sum 1x2 + 2x3 + 3x4 + 4x5 + ... + 10x11 in summation notation.

Read Solution (Total 1)

1*2=2
2*3=6
3*4=12
4*5=20
5*6=30
6*7=42
7*8=56
8*9=72
9*10=90
10*11=110

=440
9 years agoHelpfull: Yes(0) No(0)

exam Other Question

I want to know the volume contained in the sphere up to height of 86 cm from bottom (sphere Inside diameter is 19000 mm) Please help me with these problems.I cant figure them out.

SIMPLIFY EACH OF THE FOLLOWING.BEGIN WITH THE INNERMOST PARENTHESES.

1). (8x-y)-[-(2x + y)-(3x-6y)]

2). 6