Question

2. If S.
20
2
If Sn = [2a + (n - 1)d]
S20 [2(-3) + (20 - 1) 7]
S20 = 10 (-6 + 133)
S20 = 1270 Answer the following
a) Find 'a' and 'd'
b) Sum of how many terms is 1270?
c) Write an A.P. from given solution.​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

Answer:

Step-by-step explanation:

a= -3,d=7,

sum of 20 terms,

-3,10,17,24,