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
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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