Math, asked by prabhatchaurasiyas14, 7 months ago

th term is 128,
4. In an A.P. 19 th term us 52 and 38 th teri
find sum of first 56 terny.​

Answers

Answered by jothika132002
0

Answer:

5040

Step-by-step explanation:

n÷2 ( 29+(n-1)d)

56÷2(2x-20+(56-1)4)

20×180

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