quant qestion dated 04 feb 2013

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If _f_(_n_) is the number of solution sets (_x_, _y_) for the equation _x_ \+ 2_y_ = _n_, such that _x_, _y_ and _n_ are all whole numbers, what is the value of the expression X = _f_(870) − _f_(868)? OPTIONS 1) −2 2) −1 3) 0 4) 1...
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If f(n) is the number of solution sets (x, y) for the equation x + 2y = n, such that x, y and n are all whole numbers, what is the value of the expression X = f(870) − f(868)?
OPTIONS

1) −2
2) −1
3) 0
4) 1
5) 2
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