13 term of an arithmetic sequence is 48 ,its 17 term is 64 .what is the common difference?
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Answer:
a + 12d = 48 (eqn 1
a + 16d = 64 (eqn 2
subtract
4d = 16
d= 4
put d = 4 in eqn 1
a + 12*4 = 48
a + 48 = 48
a = 0
common difference = 4
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