NDA 2018 Paper 2 | Sequence And Series Question 30 | Mathematics

Let T_r be the r^th term of an AP for r = 1, 2, 3, ...... If for some distinct positive integers m and n we have T_m = 1 / n and T_n = 1 / m, then what is T_mn equal to?

(mn)^$$-$$1

m^$$-$$1 + n^$$-$$1

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

If the second term of a GP is 2 and the sum of its infinite terms is 8, then the GP is

$$8,2,{1 \over 2},{1 \over 8},......$$

$$10,2,{2 \over 5},{2 \over {25}},......$$

$$4,2,1,{1 \over 2},{1 \over {{2^2}}}.......$$

$$6,3,{3 \over 2},{3 \over 4},.....$$

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

If a, b, c are in AP or GP or HP, then $${{a - b} \over {b - c}}$$ is equal to

$${b \over a}$$ or 1 or $${b \over c}$$

$${c \over a}$$ or $${c \over b}$$ or 1

1 or $${a \over b}$$ or $${a \over c}$$

1 or $${a \over b}$$ or $${c \over a}$$

NDA 2018 Paper 1

MCQ (Single Correct Answer)

+2.5

-0.83

If the ratio of AM and GM of two positive numbers a and b is 5 : 3, then a : b is equal to

3 : 5

2 : 9

9 : 1

5 : 3

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