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##AAYUSH JAIN
##AAYUSH JAIN
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a12 = 37
a + 11d = 37
a + 11 × 3 = 37
a + 33 = 37
a = 4
Sn = n/2 [2a + (n-1)d]
S12 = 12/2 [2×4 + (12 -1) 3] = 6 ( 8 + 11 × 3) = 246
a + 11d = 37
a + 11 × 3 = 37
a + 33 = 37
a = 4
Sn = n/2 [2a + (n-1)d]
S12 = 12/2 [2×4 + (12 -1) 3] = 6 ( 8 + 11 × 3) = 246
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