the first of arithmetic sequence is -3.3 is 19th term is is 5.7 find difference
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Step-by-step explanation:
Given: a=-3.3, a19=5.7, n=19.
To find: d=?
Formula: an=a+(n+1)d
5.7=-3.3+(19-1)d
5.7+3.3=18d.
9/18=d
1/2=0.5=d.
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