MATHEMATICS - GCE Guide

(b) The expression for the nth term was not as successfully answered as the first part with many not understanding the topic. Those with some understandingusually applied the method of using the formula a + (n −1)d.However, many did not realise that d was negative and the positive difference led to the commonly seen answer of 22 + 7n.Others had a correct un-simplified expression but ................
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