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U4 = a+3b
49 = 25 + 3b
3b = 49-25
3b = 24\
b = 24/3 = 8
maka
a=25
b = 8
Sn = n/2(2a+(n-1)b)
S10 = 10/2(2x25 + (10-1)8)
S10 = 5 (50 + (9x8)
S10 = 5 (50+72)
S10 = 5(122)
S10 = 610
= 24/3
= 8
a+3(b)=49
a+24=49
a=49-24
a= 25
u10=25+(9)8
=25 +72
= 97