Question : Direction: In the following question, find 20th term in the given series.
9, 5, 1, –3, –7, –11, .......................
Option 1: – 67
Option 2: – 64
Option 3: – 75
Option 4: – 70
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Correct Answer: – 67
Solution : Given: 9, 5, 1, –3, –7, –11, .......................
The given series is an A.P. series and the concept used here is Tn = a + (n – 1)d
where, a = first term, n = number of terms, d = difference between the consecutive terms and Tn = last term of the series.
In the given series, a = 9, n = 20, d = – 4, Tn = ?
T20 = 9 + (20 – 1)(– 4)
T20 = 9 + 19 × (– 4)
T20 = 9 + (– 76) = 9 – 76 = – 67
Hence, first option is correct.
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Question : Directions: In the following question, select the one that is different from the other three alternatives.
Option 1: 3 – 9
Option 2: 5 – 25
Option 3: 7 – 49
Option 4: 8 – 64
Question : Directions: In the following question a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series. 1, 1, 2, 3, 5, ?, 13, 21
Option 1: 6
Option 2: 9
Option 3: 7
Option 4: 8
Question : Directions: In the following question a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series. 17, 13, 11, 7, 5, ?
Option 1: 0
Option 2: 1
Option 3: 2
Option 4: 3
Question : Directions: Which of the following interchanges in two mathematical operators will balance the equation given below? 75 ÷ 15 × 8 + 14 – 5 = 67
Option 1: ÷ and ×
Option 2: – and ÷
Option 3: – and ×
Option 4: + and –
Question : Directions: In the following question, you have to identify the correct response from the given premises stated according to the following symbols. If – stands for division, + stands for multiplication, ÷ stands for subtraction and × stands for addition, then which of the following equations holds true?
Option 1: 4 × 5 + 9 – 3 ÷ 4 = 15
Option 2: 4 – 5 × 9 + 3 ÷ 4 = 32
Option 3: 4 – 5 ÷ 18 × 3 – 4 = 70
Option 4: 4 ÷ 5 + 9 – 3 ÷ 4 = 81
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