class 10th
ssc board
subject math
lesson 3
all formula
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S = n/2 (first term + last term
S = n/2[2a + (n − 1) × d]
an = a + (n − 1) × d
a, a + d, a + 2d, a + 3d, a + 4d, ………. ,a + (n – 1) d
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