AP GP Questions for SSC CGL
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Question 1: The 3rd and 9th term of an arithmetic progression are -8 and 10 respectively. What is the 16th term?
a) 34
b) 28
c) 25
d) 31
Question 2: What is the sum of the first 12 terms of an arithmetic progression if the first term is -19 and last term is 36?
a) 192
b) 230
c) 102
d) 214
Question 3: What is the sum of the first 12 terms of an arithmetic progression if the 3rd term is -13 and the 6th term is -4?
a) 67
b) 45
c) -30
d) -48
Question 4: What is the sum of the first 17 terms of an arithmetic progression if the first term is -20 and last term is 28?
a) 68
b) 156
c) 142
d) 242
Question 5: If the 3rd and the 5th term of an arithmetic progression are 13 and 21, what is the 13th term?
a) 53
b) 49
c) 57
d) 61
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Question 6: The greatest number,that divides 43, 91 and 183 so as to leave the same remainder in each case, is
a) 9
b) 8
c) 4
d) 3
Question 7: The greatest number among $\sqrt{5}$,$\sqrt[3]{4}$,$\sqrt[5]{2}$,$\sqrt[7]{3}$ is
a) $\sqrt[3]{4}$
b) $\sqrt[7]{3}$
c) $\sqrt{5}$
d) $\sqrt[5]{2}$
Question 8: What is the greatest number which when divides 460, 491 and 553, leave 26 as remainderin each case?
a) 33
b) 27
c) 35
d) 31
Question 9: If the 10-digit number 897359y7x2 is divisible by 72, then what is the value of(3x-y), for the possible greatest value of y ?
a) 3
b) 8
c) 7
d) 5
Question 10: If the Arithmetic mean of 7, 5, 13, x and 9 is 10, then the value of x is
a) 10
b) 12
c) 14
d) 16
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Answers & Solutions:
1) Answer (D)
Let the first term of an AP = $a$ and the common difference = $d$
3th term of AP = $A_3=a+2d=-8$ ———-(i)
9th term = $A_9=a+8d=10$ ——–(ii)
Subtracting equation (i) from (ii), we get :
=> $8d-2d=10-(-8)$
=> $6d=18$
=> $d=\frac{18}{6}=3$
Substituting it in equation (ii), => $a=10-8(3)=10-24=-14$
$\therefore$ 16th term = $A_{16}=a+15d$
= $-14+15(3)=-14+45=31$
=> Ans – (D)
2) Answer (C)
First term of AP = $a=-19$ and last term = $l=36$
Number of terms = $n=12$
Sum of AP = $\frac{n}{2}(a+l)$
= $\frac{12}{2}(-19+36)$
= $17 \times 6=102$
=> Ans – (C)
3) Answer (C)
$T_{3}$ = a + 2d = -13——-(1)
$T_{6}$ = a + 5d = -4——-(2)
on solving (1) and (2)
d = 3 & a = -19
$S_{n}=\frac{n}{2}[2a+(n-1)d]$
$S_{12}=\frac{12}{2}[2(-19)+(12-1)(3)]$
$S_{12}=(6)[-38+33]$
$S_{12}=-30$
So the answer is option C.
4) Answer (A)
First term of AP = $a=-20$ and last term = $l=28$
Number of terms = $n=17$
Sum of AP = $\frac{n}{2}(a+l)$
= $\frac{17}{2}(-20+28)$
= $17 \times 4=68$
=> Ans – (A)
5) Answer (A)
$T_{3}$ = a + 2d = 13——-(1)
$T_{5}$ = a + 4d = 21——-(2)
on solving (1) AND (2)
d = 4 & a = 5
$T_{13}$ = a + 12d = 5 + 12(4) = 5 + 48 = 53
So the answer is option A.
6) Answer (C)
3 numbers are 43,91,183
largest number is 183
smallest number is 43
subtract smallest number from both the highest number
so 183 – 43 = 140
91 – 43 = 48
91 is smaller than 183, so subtract 91 from 183
183 – 91 = 92
now we have 3 numbers 140,48,92
so HCF of 140,48,92 = 4
thus the greatest number,that divides 43, 91 and 183 so as to leave the same remainder in each case, is 4
7) Answer (C)
8) Answer (D)
Subtract each number by 26
so we get
460 – 26 = 434
491 – 26 = 465
553 – 26 = 527
now taking HCF (434, 465 , 527) = 31 ( since 31 divides all the 3 numbers)
9) Answer (C)
10) Answer (D)
Arithmetic mean of 7, 5, 13, x and 9 = 10
=> $\frac{(7+5+13+x+9)}{5}=10$
=> $34+x=10 \times 5=50$
=> $x=50-34=16$
=> Ans – (D)
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