How to Find Sum Of first two in AP
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We will learn how to find the sum of first n terms of an Arithmetic Progression.
Prove that the sum Snn of n terms of an Arithmetic Progress (A.P.) whose first term ‘a’ and common difference ‘d’ is
S = n2n2[2a + (n - 1)d]
Or, S = n2n2[a + l], where l = last term = a + (n - 1)d
Proof:
Suppose, a11, a22, a33, ……….. be ann Arithmetic Progression whose first term is a and common difference is d.
Prove that the sum Snn of n terms of an Arithmetic Progress (A.P.) whose first term ‘a’ and common difference ‘d’ is
S = n2n2[2a + (n - 1)d]
Or, S = n2n2[a + l], where l = last term = a + (n - 1)d
Proof:
Suppose, a11, a22, a33, ……….. be ann Arithmetic Progression whose first term is a and common difference is d.
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you can find the sum by using formula
Sn = n/2{2a + (n-1)d }
Where n is number of term
a is first term
d is common difference
Sn = n/2{2a + (n-1)d }
Where n is number of term
a is first term
d is common difference
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