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b = 7 - 4 =3
S20 = n/2( 2a + (n-1)b
= 20/2 ( 2x4 + (20-1)3
= 10 ( 8 + (19)3)
= 10 ( 8 + 57)
= 10(65)
= 650
= 10 (8 + 19.3)
= 10 (8 + 57)
= 10 (65)
= 650