hallo friends important formulas from Arithmatic Progression ,std 10
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Sn = n/2 (2a+(n-1)d) .
Sn= n/2(a+l)
an= Sn- Sn-1
an= a+(n-1)d
n term from the last = l- (n-1) d
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important formula for Arithmatic Progression are -
##hope these is helpful##
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