Mathematics → Math MCQs

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**36.**

(A) –8

(B) –6

(C) –4

(D) –2

**37.** What is the sum of the sequence: 2+4+6+ ….. +98+100 = ?

(A) 2450

(B) 2500

(C) 2550

(D) 2600

**38.** What is the sum of the numbers: 1, 2, 3, 4, ….. 99, 100 ?

(A) 5000

(B) 5050

(C) 5100

(D) 5150

**39.** In a class of 60 students the ratio of boys to girls is 3:2. How many girls are there in the class?

(A) 21

(B) 22

(C) 23

(D) 24

**40.** What is the volume of a right-circular cylinder in cm² having radius 2cm and height 7cm?

(A) 86 cm^{2}

(B) 88 cm^{2}

(C) 90 cm^{2}

(D) 92 cm^{2}

**ANSWERS: MATH MCQS**

36. (A) –8

37. (C) 2550

38. (B) 5050

39. (D) 24

40. (B) 88 cm^{2}

**SOLUTIONS: MATH MCQS**

**36. (A)**

**37. (C)** This is an arithmetic sequence with common difference of 2. The first element is 2, the last element is 100, and total elements (from 2 to 100) are 50. So, a_{1} = 2, a_{n} = 100, d = 2 and n = 50. So, by using the formula for the sum of n elemets of an arithmetic sequence, we have

**38. (B)** These are the first 100 natural numbers (n=100). So, by applying formula for the sum of the first n natural numbers, we have

**39. (D)**

**40.** (B) Here, r=2 and h=7. Hence, by using formula for finding volume of a right-circular cylinder, we have

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