Quantitative Aptitude

Directions (Q. 1-10): What should come in place of question mark (?) in the following series?

1. 80 85 ?  87 76 89

1) 78

2) 76

3) 74

4) 75

5) 72

2. 5 13 25 ? 61 85

(1) 38

(2) 39

(3) 43

(4) 42

(5) 41

3. ?  12 30 56 90 112

(1) 1

(2) 2

(3) 3

(4) 4

(5) 5

4. 11 121 1331 14641 ? 771561

(1) 164031

(2) 162021

(3) 155021

(4) 161051

(5) 15071

5. 10  ? 69  280  1405 8436

(1) 22

(2) 20

(3) 23

(4) 25

(5) 24

6. 123 140 106 157 89 ?

(1) 214

(2) 139

(3) 198

(4) 169

(5) 174

7. 190 94 46 22 ? 4

(1) 19

(2) 15

(3) 10

(4) 8

(5) 16

8. 320 310 290 250 170 ?

(1) 114

(2) 110

(3) 10

(4) 98

(5) 142

9. 3 4 9 28 113 ?

(1) 782

(2) 424

(3) 646

(4) 384

(5) 566

10. 8 4 6 15 ? 236.25

(1) 64.5

(2) 84

(3) 52.5

(4) 36

(5) 46

11. 379, 390, 412, 445………544

(1) 462

(2) 511

(3) 538 

(4) 489

(5) 504

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Answers with Explanation !!!!!!!!!!! 

1. (1); The series is:
80+5=85, 85-7=78, 78+9=87, 87-11=76, 76+13=89

2. (5); The series is 1^2+2^2, 2^2+3^2,3^2+4^2,4^2+5^2,5^2+6^2

3. (2); The series is 1×2,3×4,5×6,7×8,9×10

4. (4); The series is 11,11^2,11^3,11^4,11^5……………….

5. (1); 10×2+2=22,22×3+3=69,69×4+4=280

6. (5); The series is +17, -34, +51, -68, +85…………
i.e next number=89+85=174

7. (3); The series is ÷2-1,÷2-1, …………..
(22/2)-1=10

8. (3); Difference between the number are -10, -20, -40, -80, -160

9. (5); 3×1+1=4,4×2+1=9,9×3+1=28,28×4+1=113,113×5+1=566

10. (3); 8×0.5=4,4×1.5=6,6×2.5=15,15×3.5=52.5

11. (4); Difference between the number are

+11, +22, +33, +44, +55