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1. 124,36 12,5 1020,(B)a . 7084; b . 7 1428; c . 8 1632; D.9 1836

This problem is a combination of numbers.

1 * 2 = 22 * 2 = 4 124.

3 * 2 = 6 6 * 2 = 12 constitutes 36 12.

5 * 2 = 10 10 * 2 = 20 makes up 5 1020.

See that the first number has increased by 2.

So the number of the next head is 7.

28 groups in 7 * 2 =1414 * 2 = 71428.

2.87,57,36, 19,(D), 1 a . 17; b . 18; c . 16; D. 10

87 8*7=56 56+ 1=57

57 5*7=35 35+ 1=36

36 3*6= 18 18+ 1= 19

19 1*9=9 9+ 1= 10

10 1*0=0 0+ 1= 1

This is to separate two numbers, multiply them and add one.