The missing number in the given series is; 40
24, 32, _, 48, 56
a_n = a + (n - 1)d
Where;
a_n is the nth term
a is the first term
n is the number of the term
d is common difference
a = 24
d = 8
Thus;
a_3 = 24 + (3 - 1)8
a_3 = 24 + 16
a_3 = 40
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