1. What number should replace the question mark ?
20,21,23,26,?,35.
A:- 30
20
20+1 = 21
21+2 = 23
23+3 = 26
26+4 = 30
30+5 = 35.
2. Look at this series : 21,9,21,11,21,13,21,..... What number should come next ?
A:- 15
21
21-12 = 9
9+12 = 21
21-10 = 11
11+10 = 21
21-8 = 13
13+8 = 21
21-6 = 15
15+6 = 21.
3. What number should replce the question mark ?
10,12,16,24,40,72,136,?
A:- 264
10
10+2 = 12
12+4 = 16
16+8 = 24
24+16 = 40
40+32 = 72
72+64 = 136
136+128 =264.
4. Look at this series : 58,52,46,40,34,..... What number should come next ?
A:- 28
58
58-6 = 52
52-6 = 46
46-6 = 40
40-6 = 34
34-6 = 28.
20,21,23,26,?,35.
A:- 30
20
20+1 = 21
21+2 = 23
23+3 = 26
26+4 = 30
30+5 = 35.
2. Look at this series : 21,9,21,11,21,13,21,..... What number should come next ?
A:- 15
21
21-12 = 9
9+12 = 21
21-10 = 11
11+10 = 21
21-8 = 13
13+8 = 21
21-6 = 15
15+6 = 21.
3. What number should replce the question mark ?
10,12,16,24,40,72,136,?
A:- 264
10
10+2 = 12
12+4 = 16
16+8 = 24
24+16 = 40
40+32 = 72
72+64 = 136
136+128 =264.
4. Look at this series : 58,52,46,40,34,..... What number should come next ?
A:- 28
58
58-6 = 52
52-6 = 46
46-6 = 40
40-6 = 34
34-6 = 28.
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