In an ap the first term is 2 and the sum of first 5 terms is one fourth of the next 5 terms so that its 20th term is minus 112
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an=a+{n-1}d
-112=2+{20-1}d
-112-2=19d
-114/19=d
-6=d
answer is 6
-112=2+{20-1}d
-112-2=19d
-114/19=d
-6=d
answer is 6
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