Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    2
    ReputationRep:
    3 10 17 23
    7n - 4
    is 150 a term of this sequence?
    Explanation :
    7n - 4 = 150
    Yes as 10 ends in 0, 150 also ends in 0 so 150 is in the sequence.

    Is this worth 2 marks ? ( The explanation )
    Offline

    14
    ReputationRep:
    Well no. You are supposed to prove that n is an integer to satisfy the nth term
    Offline

    2
    ReputationRep:
    What i would say is 7n-4=150 so 7n=154 154/7 = 22 so yes it is the 22nd term of the sequence
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by dh12345)
    What i would say is 7n-4=150 so 7n=154 154/7 = 22 so yes it is the 22nd term of the sequence
    oh
    thanks man
    Offline

    9
    ReputationRep:
    (Original post by Divinchi)
    3 10 17 23
    7n - 4
    is 150 a term of this sequence?
    Explanation :
    7n - 4 = 150
    Yes as 10 ends in 0, 150 also ends in 0 so 150 is in the sequence.

    Is this worth 2 marks ? ( The explanation )
    It's a very simple explanation that doesn't show how you worked it out. Here is the one for 2 marks:

    7n - 4 = 150
    +4 +4
    7n = 154
    /7 /7
    n = 22
    Yes it is in sequence.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Divinchi)
    oh
    thanks man
    how would u explain it if it isnt?
    Offline

    2
    ReputationRep:
    (Original post by Divinchi)
    how would u explain it if it isnt?
    Showing it isn't an integer should be sufficient, you could even give the terms either side of the number and show it is inbetween the two e.g if it asked you if 150 is a term you could say the 21st term is 148 and 22nd term is 154
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.