Question

1. If the 3rd and the oth term of the A.P. series are 4 and -8 respectively.
Find:
a. its first term
b. common difference
c. which term of the series be zero
d. find the sum of first 20 terms.
3​

Answer 1

Answer:

plz see the step by step explanation and ans bin the attached pic.........

Step-by-step explanation:

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hope it helps.....