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There are 15 terms in an arithmetic progression. Its first term is 5 and their sum is 390. The middle term is

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Important Questions on Sequence and Series

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MHT-CET TRIUMPH Mathematics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 7 - Sequence and Series>Critical Thinking>Q 17
The sum of first n terms of an A.P. whose last term is l and common difference is d is
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MHT-CET TRIUMPH Mathematics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 7 - Sequence and Series>Critical Thinking>Q 19
A student read common difference of an A.P. as -2 instead of 2 and got the sum of first 5 terms as -5. Actual sum of first 5 terms is
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MHT-CET TRIUMPH Mathematics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 7 - Sequence and Series>Critical Thinking>Q 20
The sum of first four terms of an A.P. is 56 and sum of last four terms is 112. If the first term is 11, then the number of terms is
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MHT-CET TRIUMPH Mathematics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 7 - Sequence and Series>Critical Thinking>Q 21
In an A.P., S1=6, S7=105, then Sn:Sn-3 is same as
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MHT-CET TRIUMPH Mathematics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 7 - Sequence and Series>Critical Thinking>Q 22
Let Sn denote the sum of first n terms of an A.P. If S2n=3Sn, then S3nSn is equal to:
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MHT-CET TRIUMPH Mathematics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 7 - Sequence and Series>Critical Thinking>Q 23
If the ratio of the sum of n terms of two A.P.'s be 7n+1:4n+27, then the ratio of their 11th  terms will be:
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MHT-CET TRIUMPH Mathematics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 7 - Sequence and Series>Critical Thinking>Q 24
If a, b, c, are in A.P. and also 1a, 1b, 1c are in A.P., then
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MHT-CET TRIUMPH Mathematics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 7 - Sequence and Series>Critical Thinking>Q 25
If a, b, c are in A.P. then a+2b-c2b+c-ac+a-b equals