Question

Find the sum of 19th terms of an A.P, where nth term is 2n+1​

Answer 1

Answer:

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Step-by-step explanation:

Answer 2

Answer:

Last term :

2n+1

= 2×19+1

= 38+1

= 39

First term :

2n+1

= 2×1+1

= 2+1

= 3

Sum of AP = n/2(a+l) = 19/2(39+3) = 19/2×42 = 19×21 = 399

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