f(1)=1, f(2)=4, f(2)=4, f(3)=9, f(3)=9, and f(4)=16.
Qty A : f(5)
Qty B: 25
Why is the answer D and not C ? Isn’t it like a sequence ?
For this question, we are given that f(1) = 1, f(2) = 4, f(3) = 9, and f(4) = 16. However, we are not given any information about f(5).
If you were to say f(5) must be 25, then you would be extrapolating that answer from a pattern that is not explicitly stated.
For example, suppose f(x) = { x^2 when x < 5 & x when x >=5}. Then, the above numbers are correct, but f(5) = 5. However, suppose f(x) = x^2, then f(5) = 25. It depends on what the function is.
You are thinking of a question like, 1,4,9,16, __. This is more of a pattern recognition question. Anything could technically be in that blank, but often pattern recognition tests want you to recognize that each are squares. 1,4,9,16,3 and 1,4,9,16,25 are both possible unless the formula for the sequence is defined.