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(a + 4b) - (a + b) = - 12
3b = -12
b = -4
U2 = a + b
46 = a - 4
a = 50
Sn = n/2 (2a + (n-1)b)
S25 = 25/2 (2(50) + 24(-4))
= 25/2 (100 - 96)
= 25/2 (4)
= 50
U2 = a + b = 46
------------------- --
3b = -12
b = -4
a = 50
S25 = (2·50 +(25-1)(-4)
= (100 - 96)
= (4)
= 50