Question

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Answer 1

A.P = 6,12,18,24,......

a = 6 , d = 6 , n= 40

Now,S40 = n/2{2a+(n-1)(d)}

S40 = 40/2{2×6+(40-1)(6)}

S40 = 20(12+(39)(6))

S40 = 20(12+234)

S40 = 20×246

S40 = 4920

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Answer 2

Answer:

hope it's helpful.....✔️✔️✔️