Find the sum of 20 odd numbers

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Find the sum of 20 odd numbers

Solⁿ Date / Update:-

23-Jul-2025 02:38PM

Solution:-

Exercise - 2 (A) Q-45.

Find the sum of 20 odd numbers.

(A) 444 (B) 210

(C) 400 (D) 600

Soln:-

Sum of odd Number Formula

= ( n )²

= ( 20 )²

= 20 * 20

= 400 Ans.

Q-45

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Manoj Prasad Total Earn: ₹ 6748.39

General & Competition Math (Vidyasagar) Ch-2, Exercise-2(A)

Q1. What is the place value of 8 in 3082.53?

Q2. What is the difference between the place value of both 7 in 27307?

Q3. Find the difference between the greatest number of four-digits and the least number of five-digits

Q4. If a number 34*24 is divisible by 9 then what digit must be given to *?

Q5. What will be the prime factorization of 420?

Q6. What is the total number of five digit?

Q7. Whose place value and face value are always same in any number?

Q8. What will be the Descending order of 2/3, 3/4, 4/5, 5/6?

Q9. Which is a rational number in the following?

Q10. What is the additive inverse of 8/3?

Q11. Which is the greatest number of five-digits using the digits 1,0,3,7 and 6?

Q12. What will the greatest two-digits prime number?

Q13. If a number is squared, then which digit may come in place of ones?

Q14. What are the total number of 4-digits in number in Number System?

Q15. Find the difference between the place values of both 7 in 743171?

Q16. Write in figures: One crore three lakhs twenty seven and three tenths

Q17. Which one of the following is always odd?

Q18. Find the number which is divided by 4 and adding 10 to the quotient leaves 16

Q19. What is the difference between the greatest number of five-digits and the greatest number of four digits?

Q20. Find the quotient of 93by3.1

Q21. If a number is cubed, then which digit may come in unit place?

Q22. 7,77,77,777 divide by 77?

Q23. A Boy was said to multiplied by 0.72 but the number multiply by 7.2 if his result is greater than 2592 than his actual result, then find the initial number

Q24. What least number is subtracted from 1000, so that number will be perfect square?

Q25. If a number is divided by 119, then the remainder is 19 If that number is divided by 17, then the find the remainder

Q26. How many numbers are in between 50 to 100 which are completely divisible by 7

Q27. What is the sum of first five prime numbers

Q28. The sum of two numbers is 29 and the difference of their square is 145, find the difference in them

Q29. A Positive number, when decreased by 4, is equal to 21 times of the reciprocal of the number find the numbers

Q30. The difference between square of two numbers is 256000 and sum of the numbers is 1000 the numbers are:

Q31. 4by5 of a certain number is 64 Half of that number is:

Q32. The sum of two numbers is 15 and the sum of their square is 113 the numbers are:

Q33. How many prime numbers are in between 1 and 10?

Q34. What will be the sum of two prime numbers?

Q35. What will be the sum of greatest number of five-digits and least number of five-digits?

Q36. What are the least and the greatest prime numbers in between 1 to 10?

Q37. Which least number is added to 97654, so that number is exactly divisible by 3?

Q38. Which least number is added to 796369, so that the number is completely divisible by 11?

Q39. Express 762 in approximate (Round off) hundreds

Q40. Round off 6789 in thousands

Q41. The product of two numbers is 323 and one of them is 17 find the other number

Q42. What is the total sum of 1 to 30?

Q43. How many times sevens are there in 10 to 100

Q44. What is the sum of 25 even numbers?

Q45. Find the sum of 20 odd numbers

Q46. What is the Roman numeral of 49?

Q47. A student was said to find the value of 2928 x 978 but by mistake he obtain the value of 2978 x 978 then what will be the more result?

Q48. If 8N97 - 325N equal to 5239, then what will be digit in N?

Q49. Which is false in the following sentence Ex 2A Q 49?

Q50. How much 108 is greater than that of its 1/3 of 1/4th part?

Q51. If the digits 6 and 9 are interchanged the place in 36490, then the difference between the new number and old number is

Q52. Change 14 into binary number system

Q53. Change 20 into binary number system

Q54. Change 1111 into decimal number?

Q55. (1 - 1/2) (1 - 2/3) (1 - 1/4)..........(1 - 1/8)

Q56. If 1+2+3+4+5+............+100=x then find the value of x

General & Competition

General & Compitition Sub-Math (Oscer)

General & Competition Sub-Math (Vidyasagar)

General & Competition Math (Vidyasagar) Ch-2: Number System

Q1. General & Competition Math (Vidyasagar) Ch-2: Formmula

Q2. General & Competition Math (Vidyasagar) Ch-2: Examples-(2A)

Q3. General & Competition Math (Vidyasagar) Ch-2, Exercise-2(A)

Q4. General & Competition Math (Vidyasagar) Ch-2, Example-2(B)

Q5. General & Competition Math (Vidyasagar) Ch-2, Exercise-2(B)

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