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anonymous

  • 5 years ago

write the following sequence in an form and find the value of the 15th term 4,9,14,19. What is the sum of the first 15 terms of the above sequence?

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  1. mathteacher1729
    • 5 years ago
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    Opening question: What is the pattern in this sequence? In other words, how do we get the next term, and the next, and the next...

  2. anonymous
    • 5 years ago
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    add 5 would the equation be an=-1 + 5n?

  3. anonymous
    • 5 years ago
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    it is an arithmatic progresion.series.... a = 4, d= 5, n=15 sum of 15 terms S15= n/2[ 2a +(n-1)d] = 15/2[ 8+14*5] = 15/2[78] = 15*39 = 585

  4. anonymous
    • 5 years ago
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    the formula for sum is s of n= n(a sub 1 + a sub n) divided by 2

  5. anonymous
    • 5 years ago
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    15 th term = a+(n-1)d = 4 + 14*4 =60

  6. anonymous
    • 5 years ago
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    i got 59..

  7. anonymous
    • 5 years ago
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    sorry, it is 4 + 14*5 = 74

  8. anonymous
    • 5 years ago
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    ok and what is the equation of the sequence in a sub n form

  9. anonymous
    • 5 years ago
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    do you have aim?

  10. anonymous
    • 5 years ago
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    already written......... a = first term d= common difference n= number of terms

  11. anonymous
    • 5 years ago
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    no it has to be like an=-1+5n is that right?

  12. anonymous
    • 5 years ago
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    for nth term a+(n-1)d for sum of first n terms n/2[2a +(n-1)d]

  13. anonymous
    • 5 years ago
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    yeah iknow but you plug in a as 4 and d as 5 and simplify what you can i thought?

  14. anonymous
    • 5 years ago
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    if you have problem to understand it , you r welcome to talk to me using skype, i m unable to explain it.......... skype id : sudhanshu_kmr

  15. anonymous
    • 5 years ago
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    do you have instant messenger?

  16. anonymous
    • 5 years ago
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    no......

  17. anonymous
    • 5 years ago
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    ok another question for you:\[\sum_{n=1}^{3}i^n-1\]

  18. anonymous
    • 5 years ago
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    its i to the n-1 power

  19. anonymous
    • 5 years ago
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    i +i^2 +i^3 -1 = i -1 - i -1= -2 as i^2 = -1, i^3 = -i

  20. anonymous
    • 5 years ago
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    i ended up with an answer of i?

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