Arithmetic Progression (A.P):
An A.P. is of the form a, a+d, a+2d, a+3d, ...
where a is called the 'first term' and d is called the 'common difference'
nth term of an A.P. tn = a + (n-1)d
Sum of the first n terms of an A.P. Sn = n/2[2a+(n-1)d] or
Sn = n/2(first term + last term)
Geometrical Progression (G.P):
A G.P. is of the form a, ar, ar2, ar3, ...
where a is called the 'first term' and r is called the 'common ratio'.
nth term of a G.P. tn = ar^(n-1)
Sum of the first n terms in a G.P. Sn = a|1-r^n|/|1-r|
Note : ^ denotes to the power of something here
An A.P. is of the form a, a+d, a+2d, a+3d, ...
where a is called the 'first term' and d is called the 'common difference'
nth term of an A.P. tn = a + (n-1)d
Sum of the first n terms of an A.P. Sn = n/2[2a+(n-1)d] or
Sn = n/2(first term + last term)
Geometrical Progression (G.P):
A G.P. is of the form a, ar, ar2, ar3, ...
where a is called the 'first term' and r is called the 'common ratio'.
nth term of a G.P. tn = ar^(n-1)
Sum of the first n terms in a G.P. Sn = a|1-r^n|/|1-r|
Note : ^ denotes to the power of something here
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