In an A.P 19th term is 52 and 38th term is 128 find the sum of first 56 terms
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In an A.P 19th term is 52 and 38th term is 128 find the sum of first 56 terms
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Answer:
5040
Step-by-step explanation:
a+18d=52
a+37d=128
d=4
a=(-20)
Sum=5040