Question

If I = a +(n-1)d, write the formula for the subject n,
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Answer 1

Step-by-step explanation:

here is the answer in pic

Answer 2

n is the number of terms in A.P.

an=a+(n-1)d

an=a+nd-d

an-a+d=nd

$\frac{an - a + d}{d} = n$

where an=last term

a=first term

d=common difference

n=number of terms

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