for an A.P find s12 if a= -5 and d= -4
plzz solve this question step by step fast i will mark you as brainlist
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a = - 5, d = - 4
S n = n / 2 [ 2a + ( n - 1) d ]
S ₁₂= 12 / 2 [ 2 ( - 5) + ( 12 - 1) ( - 4 )]
S ₁₂ = 6 [ - 10 + 11 ( - 4 ) ]
S ₁₂ = 6 [ - 10 - 44]
S ₁₂= 6 * ( - 54 )
S ₁₂ = - 324.
a = - 5, d = - 4
S n = n / 2 [ 2a + ( n - 1) d ]
S ₁₂= 12 / 2 [ 2 ( - 5) + ( 12 - 1) ( - 4 )]
S ₁₂ = 6 [ - 10 + 11 ( - 4 ) ]
S ₁₂ = 6 [ - 10 - 44]
S ₁₂= 6 * ( - 54 )
S ₁₂ = - 324.
Anonymous:
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