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Let Xk=(p1*p2*...*pk)+\ 1,where\ p1,\ p2...

Let `X_k=(p_1*p_2*...*p_k)+\ 1,where\ p_1,\ p_2,\ ...,p_k` are the first `k` primes. Consider the following : 1. `X_k` is a prime number. 2. `X_k` is a composite number . 3. `X_k+1\ ` is always an even number. Which of the above is/are correct? (a) 1 only (b) 2 only (c) 3 only (d) 1 and 3

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RS AGGARWAL-NUMBER SYSTEM-All Questions
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  2. What is the first value of n for which n^2+n+41 is not a prime? 1 ...

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  3. Let Xk=(p1*p2*...*pk)+\ 1,where\ p1,\ p2,\ ...,pk are the first k prim...

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  4. 6xx3\ (3-1) is equal to 19 (b) 20 (c) 36 (d) 53

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  5. 1234+2345-3456+4567=\ ? (a) 4590 (b) 4670 (c) 4680 (d) 4690 ...

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  6. 5566−7788+9988=? +4444 (a) 3223 (b) 3232 (c) 3322 (d) 3333 (e) None of...

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  7. 38649-1624-4483=? 32425 (b) 32452 (c) 34522 (d) 35422 None of t...

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  8. 884697-773697-102479=\ ?\ 8251 (b) 8512 (c) 8521 (d) 8531 None...

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  9. 10531+4813-728=?xx87 168 (b) 172 (c) 186 (d) 212 None of these

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  10. What is 394 times 113? 44402      (b)  44522           (c)  44632  ...

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  11. 1260\ -:14\ -:9=? 9 (b) 10 (c) 81 (d) 810 None of these

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  12. 136xx12xx8=?dot 12066 (b) 13046 (c) 13064 (d) 13066 None of the...

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  13. 8888+848+88-?=7337+737 1450 (b) 1550 (c) 1650 (d) 1750 None of ...

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  14. 414xx?xx7=127512 36 (b) 40 (c) 44 (d) 48 None of these

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  15. Product of 82540027 and 43253 is (a) 3570103787831          (b) 35701...

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  16. (46351-36418-4505)-:?=1357 2 (b) 3 (c) 4 (d) 6 (e) None of t...

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  17. 6xx66xx666=? 263376 (b) 263763 (c) 263736 267336 (e) None of th...

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  18. If you subtract- 1 from + 1, what will be the result? -2 (b) 0 (c...

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  19. 8+88+888+8888+88888+888888=? 897648 (b) 896748 986748 (d) 987648 None...

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  20. From the sum of 17 and 12 subtract 48. -43 (b) - 48 (c) -17 (d) ...

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