Answer :

(i)

a = -9, d = -14 + 9 = -5


a30= a + 29d


= -9 + 29(-5) = -154


a20= a + 19d


= -9 + 19(-5) = -104


a30 – a20= -154 – (-104)


= -154 + 104


= -50


(ii)


a = a, d = a + d – a = d


a30= a + 29d


a20= a+ 19d


a30 – a20 = a + 29d – a – 19d


= 10d


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