Find the sum of :
(a) -25 -21 -17................ to 24 Terms.
pls answer me crctly otherwise I will report ur answer....who knows my this answer...
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to find sum upto 24 terms of tne series
-25 , -21, -17.............
this series is in Arithmetic Progression
a = -25 , d = 4 and n = 24
formula used : Sₙ = n/2 [ 2a + (n - 1) d ]
and d = a₂ - a₁ = a₃ - a₂
=> S₂₄ = 24/2 [ 2*(-25) + (24 - 1)*4 ]
=> S₂₄ = 12 [ -50 + 23*4 ]
=> S₂₄ = 12 [ -50 + 92 ]
=> S₂₄ = 12 [ 42 ]
=> S₂₄ = 504
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