find the Sum of first 24 terms whose
nth term is an = 3+2n
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2
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Answered by
1
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672
Step-by-step explanation:
nth term =3+2n
so,1st term =3+2*1=3+2=5=a
2nd term=3+2*2=3+4=7
3rd term=3+2*3=3+6=9
so,common difference d=2
sum of first 24 terms is
n/2{2a+(n-1)d}
24/2{2.5+(24-1).2}
=12{10+23*2}
=12(10+46)
=12*56
=672
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