Black lung disease occurs in people working in
The correct answer is D
5 ? 205 823 7405 29623
3 5 15 75 1125 ?
8 9 22 75 316 ?
16 9 ? 13.25 22.625 36.3125
The number of terms in the sequence 20, 25, 30, ….., 160 is:
388, ?, 98, 49, 24, 15
7 15 44 89 ? 533
7 14 42 168 840 ?
1 2 9 ? 65 126
22 23 32 57 106 ?
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