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U7= 38
a+2b = 18
a+6b= 38
---------------- -
... -4b= -20
....... b= -20/-4
....... b= 5
a+2b = 18
a+2(5)= 18
a+10= 18
a= 18-10
a= 8
S24 = n/2 (2a+(n-1)b)
S24= 24/2 (2(8)+(24-1)5)
S24= 12 (16+23(5)
S24= 12 (16+115)
S24= 12(131)
S24= 1572 <------- jawaban
"Mohon jadikan sbg jawaban yg terbaik ya,,,"