Answers

2015-10-29T09:25:25+05:30
Arithmetic progression has only four formulas.
An= a+( n - 1)d
Sn= n/2 ( 2a + ( n-1) d)
Sn= n/2 ( a + l).
the last formula remains changing according to the term you have to find.
this is like...
a+d=a2
a+ 2d= a3 and so on.
the values are
a is the first term of AP.
d is the equal difference between terms.
Sn is the sum of n terms.
n is no. of terms.
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2015-10-29T17:55:39+05:30
An=a+(n-1)d Sn=n/2(2a+(n-1)d Sn=n/2(a+1)
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