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CBSE Class 10 Answered

In an arithmetic sequence: S20 = 500. a20 = 44 Find the first term a 1​
Asked by sasidharan.simmi | 24 Nov, 2020, 01:35: AM
answered-by-expert Expert Answer
a subscript 20 equals 44
a plus left parenthesis 20 minus 1 right parenthesis d equals 44
a plus 19 d equals 44 minus negative negative negative negative negative negative negative negative left parenthesis 1 right parenthesis
S subscript 20 equals 500
20 over 2 open square brackets 2 a plus left parenthesis 20 minus 1 right parenthesis d close square brackets equals 500
2 a plus 19 d equals 50 minus negative negative negative negative negative negative negative negative negative left parenthesis 2 right parenthesis
o n space s o l v i n g space e q u a t i o n space left parenthesis 1 right parenthesis space a n d space left parenthesis 2 right parenthesis
a equals 6
Answered by Utkarsh Lokhande | 27 Nov, 2020, 10:52: AM
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