72.
325, 259, 204, 160, 127, 105, ?

75.
45, 54, 47, ?, 49, 56, 51, 57, 53

76.
3, 8, 13, 24, 41, ?

77.
10, 14, 26, 42, 70, ?

80.
One term in the number series is wrong. Find out the wrong term.
121, 143, 165, 186, 209

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