if an ap if a=1 an=20 and sn=42 <br />then n is
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please refer to the attachment!!
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Given :-
- a = 1
- = 20
- = 42
❤ = × n
- 42 = × n
- 42 = × n
- 21 n = 42 × 2
- n =
- n =
❤
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