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CBSE Class 11-science Answered

in an ap,the first term is 2.if the sum of the first 5 terms is one-fourth the sum of next 5 terms show that the 20th term is -112
Asked by | 02 Aug, 2012, 12:19: PM
Expert Answer

Therefore, 20th term = a20 = a + (n - 1)d

                                = 2 + (19)(-6) = 2 - 114 = -112

Answered by | 02 Aug, 2012, 09:57: PM
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