a=7 तथा a13=35 दिया गया हो तो d और s13 गयात कीजिए
Answers
Answered by
1
HEYA!!
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Arithmetic Progressions :-
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A [ First term ] = 7
A13 = 35
A + 12 d = 35
7 + 12d = 35
12d = 28
d=2
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S13 = 13/2 { 14 + 12×2}
= 13/2 { 14 + 24 ]
13/2 × 38
19× 13
=247.
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--------
Arithmetic Progressions :-
-----------------------------------------------------
A [ First term ] = 7
A13 = 35
A + 12 d = 35
7 + 12d = 35
12d = 28
d=2
-----------------------------------------------------
S13 = 13/2 { 14 + 12×2}
= 13/2 { 14 + 24 ]
13/2 × 38
19× 13
=247.
---------------------------------------------------☺---------------------------------------------------
Answered by
0
Answer:
d = 7/3, Sn=273
Step-by-step explanation:
First term of an AP = a = 7
Thirteenth term of an AP = 35
a + 12d = 35 ------(1)
Substitute a in eq - (1)
a + 12d = 35
(7) + 12d = 35
12d = 35 - 7
12d = 28
d = 28/12
d = 7/3
In an AP sum of the terms = n/2 ( a + an )
= 13/2 ( 7 + 35)
= 13/2 ( 42)
= 13(21)
= 273
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