Question

A1=6 d=4 n=12 sn= step by step

Answer 1

Sn = n/2 [2a + (n-1)d]
    = 12/2 [2x6 + (12-1)4]
    = 6 [12 + (11)4]
    = 6 [12+44]
    = 6[56]
    = 336

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