Hi According to me, Option 1 alone is in-sufficient as it does not give us a value for y. This one was correctly pointed out by you. As for option 2, it gives us a value of x/y = 2/3. However, this is the reduced fraction value and does not necessarily mean that x=2 and y=3. It could also mean x=4, ...

Hey I'll try to do the same thing that Niket did, in a different and possibly easier way :) You equation is: An = [A(n-1) + A(n-2)]/2 A5 = (A4 + A3)/2 => 20 = (A4 +4)/2 => 40 = A4 + 4 => A4 = 40-4 => A4 = 36 Now, A6 = ( A5 + A4 )/2 => A6 = (20 + 36)/2 => A6 = 56/2 => A6 = 28 Hence, Option E

This question is confusing, and I too can't understand the reasoning. Nor can I understand the above explanation.

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