Find the sum of the first 24 terms of the arithmetic sequence 8, 13, 18,...
Answers
Answered by
2
Answer:
123
Step-by-step explanation:
a=8,d=13-8=18-13=5,n=24
an=a+(n-1)d
=8+(24-1)5
=8+23×5
=8+115
=123
Answered by
1
Answer:
1572
Step-by-step explanation:
given: a =8 , d =5
sum of first n terms of an A.P ,Sn = n/ 2 ( 2a + ( n - 1 ) d )
S
24 = 24 / 2 ( 2 (8) + (24 - 1) (5) )
=12 (16 + 23 X 5 )
= 12 ( 16 + 115 )
=12 (131 )
1572
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