Write the correct number in the given boxes from the following A. P.
– 3, – 8, – 13, – 18, . . .
Here 
– 3, – 8, – 13, – 18, . . .
First term a = – 3
Second term t1 = – 8
Third term t2 = – 13
Fourth term t3 = – 18
We know that d = tn + 1 – tn
Thus, t2 – t1 = – 13 – ( – 8) = – 13 + 8 = – 5
t3 – t2 = – 18 – ( – 13) = – 18 + 13 = – 5
Thus, d = – 5
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