Which term of the ap 4,1,-2 is -77?
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Step-by-step explanation:
A= 4
A= 4 D= 1-4 = -3
AN = a + (n - 1) × d
-77 = 4 + (n - 1) × -3
-77 - 4 = (n - 1) × -3
-41 = -3n +3
-41 - 3 = -3n
-44 / -3 = n
14.6 = n
15 = n. or 14 = n
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