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JAYIN SUKEJA CLASS 10TH B. MATHS ACTIVITY
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- 1an = a + (n − 1) × dIn an AP, given a=8,a
n =62,S n =210m find n and d.
a=8,a
n
=62,s
n
=210
a
n
=a+(n−1)d
62=8+(n−1)d
54=(n−1)d
s
n
=
2
n
[2a+(n−1)d]
210=
2
n
[16+(n−1)d]
420=n[16+54]
420=70n
n=6
54=(6−1)d
d=
5
54
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- Flashcards on JAYIN SUKEJA CLASS 10TH B. MATHS ACTIVITY , created by Jayin Sukeja on 25/07/2021.
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