4n - 2
2(3n - 1)
n2 + n
n2 + 3n + 2
Correct answer is C
Given that 2, 6, 12, 20...? the nth term = n2 + n
check: n = 1, u1 = 2
n = 2, u2 = 4 + 2 = 6
n = 3, u3 = 9 + 3 = 12
∴ n = 4, u4 = 16 + 4 = 20
From the diagram above, Find the value of < ROP ...
Find the mean of 10, 8, 5, 11, 12, 9, 6, 3, 15, and 23. ...
There are 8 boys and 4 girls in a lift. What is the probability that the first person who steps...
The probability of an event P is 34 while that of another event Q is 16. I...
Which of the following lines is not parallel to the line 3y + 2x + 7 = 0? ...
If the simple interest on a sum of money invested at 3% per annum for 212 ye...
Two triangles have the same areas if ...
In how many ways can the word MATHEMATICS be arranged? ...
The sketch is the curve of y = ax2 + bx + c. Find a, b and c respectively...