Answer:
in an arithmetic sequence, the nth term is the first term +(n-1)times the difference
the difference between the 3rd and 4th term is 18-13=5, so d=5
now we need to find out the first term: 13=a1+(3-1)d => a1=3
the 50th term is a1+(50-1)d=3+49*5=248
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Step-by-step explanation:
