Maths Problem// AP/GP (1 Viewer)

[lolzlolz]

Can anyone help me with this math problem thanks

 

[cossine]

So what you have arithmetic sequence.

The definition is given below
a, a+d, ..., a + (n-1)d

We are told a = 1.8, a+ (n-1)d = 1.2 and n = 61. Now you need to solve for d by making it the subject