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CBSE Class 10 Answered

Q no 7 and 8 solve both
Asked by sucharitasahoo1 | 26 Nov, 2017, 10:09: AM
answered-by-expert Expert Answer
begin mathsize 16px style straight S subscript straight n equals end subscript straight n over 2 left parenthesis 2 straight a plus left parenthesis straight n minus 1 right parenthesis straight d right parenthesis straight n over 2 left parenthesis 2 straight a plus left parenthesis straight n minus 1 right parenthesis straight d right parenthesis equals 1 half left parenthesis 5 straight n squared plus 3 straight n right parenthesis 2 straight a plus left parenthesis straight n minus 1 right parenthesis straight d equals left parenthesis 5 straight n plus 3 right parenthesis 2 straight a minus straight d plus nd equals 5 straight n plus 3 comparing straight d equals 5 2 straight a minus straight d equals 3...... straight a equals 4 sub straight t subscript 40 equals straight a plus 39 straight d end style
Answered by Arun | 26 Nov, 2017, 05:12: PM

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CBSE 10 - Maths
find the sum of following 6+13+20+....+97
Asked by deepikaselvam2009 | 20 Feb, 2024, 08:57: PM
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CBSE 10 - Maths
If the sum of the first n terms of an AP be n and the sum of first n terms be m then sum of its (m+n) terms is -(m+n)
Asked by keshavsinghalhapur | 16 Jan, 2024, 08:46: PM
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CBSE 10 - Maths
If the sum of first n,2n and 3n terms of an AP be S1 S2andS3 respectively then p3 S2-S1
Asked by keshavsinghalhapur | 15 Jan, 2024, 10:56: AM
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CBSE 10 - Maths
A contract on construction job specifies penalty for delay of completion beyond a certain date as follows Rs. 200 for 1st, Rs. 250 for 2nd, and Rs. 300 for 3rd, so on. If contractor pays Rs. 27,750 as penalty, find the number of days for construction work delayed.
Asked by skandachiranjeevin | 06 Dec, 2023, 07:08: PM
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CBSE 10 - Maths
The sum of the first 7 terms of an AP is 63 and that of its next 7 terms is 161.find the AP
Asked by prassanna.j | 13 Nov, 2023, 11:24: PM
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CBSE 10 - Maths
If the pth term of an AP is 1/q and qth term 1/P. Prove that the sum of the first pqth term is 1/2 (pq + 1).
Asked by latayadav23 | 17 Oct, 2023, 08:39: PM
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CBSE 10 - Maths
if in an A.P. the sum of m terms equal to n and the sum of n terms is equal to m, then prove that the sum of (m+n) terms is -(m+n)
Asked by ananya_monica | 28 Sep, 2023, 07:07: PM
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CBSE 10 - Maths
find the sum of 8 multiple of 1.5
Asked by simmysingh1aug | 20 Sep, 2023, 10:20: PM
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CBSE 10 - Maths
find the sum of first 51 term of an AP whose second and third terms are 14 and 18 respectively.
Asked by bkhaiwangkonyak | 07 Mar, 2023, 04:35: PM
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CBSE 10 - Maths
the sum of fourth and eight terms of an A.P is 54 and their product is 665. find the sum of the first thirty terms of an A.P​
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Asked by sakshinde95 | 23 Jan, 2023, 05:50: PM
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