Question

Without adding find the dum 1+3+5+7+9+11+13=

Answer 1

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Sum of n terms in AP is

S = n/2[ a+ l]

Where,

n is the number of terms

a is the first term

l is the last term

So the sum of the given series (S)=

S = 7×[1 +13]/2

S = 7×14/2

S = 7×7 = 49

Answer 2

Answer:

Sum of n terms in AP is

S = n/2[ a+ l]

Where,

n is the number of terms

a is the first term

l is the last term

So the sum of the given series (S)=

S = 7×[1 +13]/2

S = 7×14/2

S = 7×7 = 49