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Maths Puzzle
The sum of the first 16 terms of an arithmetic sequence is 23 times the sum of the first 4 terms. Find the 10th term of the sequence if the first term is 2
Read Solution (Total 3)
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- -74
8*(4+15d)= 23*2*(4+3d)
d= -76/9
10th term = 2+9*(-76/9)) =2-76 = -74 - 12 years agoHelpfull: Yes(2) No(0)
- -360
8*(4+15d)+ 23*2*(4+3d)
d= -76/9
10th term = 5*(4+9*(-76/9)) = -360 - 12 years agoHelpfull: Yes(1) No(1)
- common difference=-76/9
10th term is -74 - 12 years agoHelpfull: Yes(1) No(2)
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