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U₇=a+23b =24
a+13b + 10b=24
14 + 10b=24
10b=24-14
10b=10
b=1
a+13b=14
a+13(1)=14
a+13=14
a=14-13
a=1
S₁₈=n/2 (2a+(n-1)b)
=18/2 (2.1+(18-1)1)
=9(2+19.1)
=9(2+19)
=9(21)
=189