Math, asked by zaidcharoliya16, 1 month ago

what is the sum of first 20 terms of an A.P if a=4 and t20=36

Answers

Answered by Shinesrivastava2005

19

Answer:

400

Step-by-step explanation:

Sum = n/2( a + l )

where a is first term

l is last term i.e. l = t20

so applying it

20/2 ( 4 + 36 )

10(40)

400

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