Common difference of arithmetic sequence is 4 and sum of first 15 terms is 450 find the 8th term of this sequence and first term?
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Answer:
GIVEN N = 15 D =4 S¹⁵ = 450
Step-by-step explanation:
SN = N/2 { 2A + (n - 1 ) d }
450 = 15 /2 { 2A + ( 15 - 1) 4 }
900 = 15 { 2A + ( 14 ) 4 }
60 { 2A + 56}
4 = 2A
A = 2
A⁸ = A +7D
A⁸ = 2 + 7(4)
A⁸ = 2 + 28
A8 = 30
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