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December 18, 2014

December 18, 2014

Posted by **simranpreet** on Monday, December 3, 2012 at 6:43am.

please help all questions please help please.

- maths -
**Praphul**, Monday, December 3, 2012 at 7:47amWe have the formula a+(n-1)d=nth term

Where a is the 1st term ,d is the difference and n is the nth term

So1st term= a

2nd term= (a+1)d

3rd term= (a+2)d

5th term=(a+4)d

Adding ad+2d+ad+ 4d= 38

2ad+ 6d= 38

In the same way 7th term=(a+6)d

10th term=(a+9)d

Adding these 2ad+15d=83

Subtracting, 9d= 45 which makes d=5

- maths -
**Reiny**, Monday, December 3, 2012 at 9:15ama+2d + a+4d=38 -->2a + 6d = 38

a+6d + a+9d = 83 --> 2a + 15d = 83

subtract them:

9d = 45

d=5

back in 2a+6d = 38

2a+30=38

a=4

the sequence is:

4 9 14 19 24 ...

BTW, the definitions used by Praphul are not correct.

e.g. he said:

5th term is (a+4)d

that should have been a + 4d, the brackets there are critical

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