Hi J, In first question, why did you eliminate option ending in 8?
Because we need n(n+1)(2n+4) ending in 2, which doesn’t happen if n ends in 8
regards J
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CAT-holics 
Hi J,
In first question, why did you eliminate option ending in 8?
Because we need n(n+1)(2n+4) ending in 2, which doesn’t happen if n ends in 8
regards
J