Math, asked by topper5795, 9 months ago

For an A.P, if S12 = -78, d = -3, n = 12, find a.

Answers

Answered by Aryanmahi1707

2

Answer:I don't know

Step-by-step explanation:

Answered by Tammany

1

Step-by-step explanation:

first formula of sum =n÷2(2a+(n-1)×d)

-78=12÷2(2a+11×-3)

then procced and solve it

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