Samacheer Kalvi 10th Maths Solutions Chapter 2 Numbers and Sequences Ex 2.10

Samacheer Kalvi 10th Maths Solutions Chapter 2 Numbers and Sequences Ex 2.10

Tamilnadu Samacheer Kalvi 10th Maths Solutions Chapter 2 Numbers and Sequences Ex 2.10

Multiple choice questions
Question 1.
Euclid’s division lemma states that for positive integers a and b, there exist unique integers q and r such that a = bq + r, where r must satisfy.
(1) 1 < r < b
(2) 0 < r < b
(3) 0 < r < b
(4) 0 < r < b
Answer:
(3) 0 < r < b

Question 2.
Using Euclid’s division lemma, if the cube of any positive integer is divided by 9 then the possible remainders are
(1) 0, 1, 8
(2) 1, 4, 8
(3) 0, 1, 3
(4) 1, 3, 5
Answer:
(1) 0,1,8
Hint:
Cube of any +ve integers 1³, 2³, 3³, 4³,. . .
1, 8, 27, 64, 125, 216 …
Remainders when 27, 64, 125 are divided by 9.

Question 3.
If the H.C.F of 65 and 117 is expressible in the form of 65m -117 , then the value of m is ………………….
(1) 4
(2) 2
(3) 1
(4) 3
Answer:
(2) 2
Hint:
117 = 3 × 3 × 13
65 = 5 × 13
H.C.F = 13
65m – 117 = 13 ⇒ 65m = 117 + 13 = 130
m = 130/65 = 2
The value of m = 2

Question 4.
The sum of the exponents of the prime factors in the prime factorization of 1729 is
(1) 1
(2) 2
(3) 3
(4) 4
Answer:
(3) 3
Hint:
1729 = 7¹ × 13¹ × 19¹

Question 5.
The least number that is divisible by all the numbers from 1 to 10 (both inclusive) is
(1) 2025
(2) 5220
(3) 5025
(4) 2520
Answer:
(4) 2520
Hint:

∴ L.C.M. of 1,2,3,4,…,10 is 2 × 2 × 3 × 5 × 7 × 2 × 3 = 2520

Question 6.
7^4k ≡ …………………. (mod 100)
(1) 1
(2) 2
(3) 3
(4) 4
Answer:
(1) 1
Hint:
7^4k ≡ . . . . . (mod 100)
7^4k = (7⁴)^k ≡ ……….. (mod 100) (7⁴ – 2401)
The value is 1.

Question 7.
Given F₁ = 1, F₂ = 3 and Fn = F_n-1 + F_n-2 then
(1) 3
(2) 5
(3) 8
(4) 11
Answer:
(4) 11
Answer:
F₁ = 1, F₂ = 3
F_n = F_n-1 + F_n-2
F₅ = F_5-1 + F_5-2 = F₄ + F₃
= F₃ + F₂ + F₂ + F₁
= F₂ + F₁ + F₂ + F₂ + F₁
= 3 + 1 + 3 + 3 + 1 = 11

Question 8.
The first term of an arithmetic progression is unity and the common difference is 4. Which of the following will be a term of this A.P …………..
(1) 4551
(2) 10091
(3) 7881
(4) 13531
Answer:
(3) 7881
Hint:
Here a = 1, d = 4
t_n = a + (n – 1) d = 1 + (n – 1) 4
= 1 + 4n – 4
= 4n – 3
4554
(i) 4n – 3 = 4551 ⇒ 4n = 4551 + 3 ⇒ n = 4554/4 = 1138.5.
It is not a term of A.P.

(ii) 4n – 3 = 10091 ⇒ 4n = 10091 + 3 = 10094
n = 10094/4 = 2523.5 it is a term of A.P.

(iii) 4n – 3 = 7881 ⇒ 4n = 7881 + 3
n = 7884/4 = 1971.
∴ 7881 is a term of the A.P.

Question 9.
If 6 times of 6^th term of an A.P is equal to 7 times the 7th term, then the 13th term of the A.P. is
(1) 0
(2) 6
(3) 7
(4) 13
Answer:
(1) 0
Hint:
6t₆ = 7t₇
6(a + 5d) = 7(a + 6d)
6a + 30d = 7a + 42d
7a + 42d – 6a – 30d = 0
a + 12d = 0 = t₁₃

Question 10.
An A.P consists of 31 terms. If its 16^th term is m, then the sum of all the terms of this A.P. is …………..
(1) 16m
(2) 62m
(3) 31m
(4) 31/2m
Answer:
(3) 31m
Hint:
M = 31
t₁₆ = m ⇒ a + 15d = m
S_n = n/2[2a + (n – 1)d]
S_n = 31/2[2a + 30d]= 312 × 2[a + 15d]
= 31 (m) = 31m

Question 11.
In an A.P., the first term is 1 and the common difference is 4. How many terms of the A.P must be taken for their sum to be equal to 120?
(1) 6
(2) 7
(3) 8
(4) 9
Answer:
(3) 8
Hint:

Question 12.
If A = 2⁶⁵ and B = 2⁶⁴ + 2⁶³ + 2⁶² + +2⁰ which of the following is true?
(1) B is 264 more than A
(2) A and B are equal
(3) B is larger than A by 1
(4) A is larger than B by 1
Answer:
(4) A is larger than B by 1
Hint:
A = 2⁶⁵
B = 2⁶⁴ + 2⁶³ + 2⁶² + … + 20
B = 2⁰ + 2¹ + 2² + … + 264
G.P = 1 + 2¹ + 2² + … + 2⁶⁴ it is a G.P
Here a = 1, r = 2, n = 65

A = 2⁶⁵, B = 2⁶⁵ – 1
∴ B is smaller.
A is larger than B by 1.

Question 13.
The next term of the sequence 3/16,1/8,1/12,1/18, ….
(1) 1/24
(2) 1/27
(3) 2/3
(4) 1/81
Answer:
(2) 1/27
Hint:

Question 14.
If the sequence t₁, t₂, t₃, …………are in A.P. then the sequence t₆, t₁₂, t₁₈, …… is ………….
(1) a Geometric progression
(2) an Arithmetic progression
(3) neither an Arithmetic progression nor a Geometric progression
(4) a constant sequence
Answer:
(2) an Arithmetic progression
Hint: t₁, t₂, t₃ …. are in A.P
t₆, t₁₂, t₁₈ …… is also an A.P. (6, 12, 18 …….. is an A.P.)

Question 15.
The value of (1³ + 2³ + 3³ + … + 15³) – (1 + 2 + 3 + … + 15) is
(1) 14400
(2) 14200
(3) 14280
(4) 14520
Answer:
(3) 14280
Hint:
(15×16/2)²−15×16/2 = (120)² – 120 = 14280