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Alex Ar [27]
3 years ago
14

The 15th term of arthimetic sequence is 43 and the common difference is 4 find the first term

Mathematics
1 answer:
Digiron [165]3 years ago
7 0

Answer:

Step-by-step explanation:

hello :

the nth term of an arithmetic sequence is :

An =An+(n-p)d   ....a common difference is : d  

let : n=15    and   p=1    d= 4     A15 =43

A15 = A1 + (15-1)(4)

43= A1 +56

A1= 43-56 = - 13

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