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SBI PO Mains
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Total Practice Qs: 24+
1 / 24
What is the sum of all 5 digit nos formed using 1,3,5,7,9 without repetetion?
A5151000
B6161600
C6666600
D5555500
Answer: Option C
Explanation:Without any Repetetion of the numbers Sum would be
(n-1)!(sum of the numbers)(1 as many times as digits of the number)
Here
(5-1)!(1+3+5+7+9)(11111)
24*25*11111 = 6666600
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2 / 24
In how many different ways could couples be picked from 8 men and 5 women?
A8
B5
C13
D40
ENone of above
Answer: Option D
Explanation:1 men from 8 men can be chosen by 8 ways
1 women from 5 women can be chosen by 5 ways
men and women = couple
so, 8*5 =40
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3 / 24
Total num of pupiles in 3 grades of scholl is 333. The no of pupiles in grades 1 and 2 are un 3:5 ratio and 2 and 3 grades are 7:11 ratio .What is the strength of class that has highest no of pupils?
A180
B174
C193
D165
ENone of above
Answer: Option D
Explanation:Ratio G1:G2=3:5 and G2:G3=7:11
So G1:G2:G3=21 : 35 : 55
Let the strength of three classes are 21x, 35x and 55x respectively, then 21x+35x+55x= 333
=> 111x= 333 or x=3
So strength of the class with highest number of pupils=55x=55*3= 165
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4 / 24
The average of 11 observations is 60. If the average of first five observations is 58 and that of the last five is 56, then the sixth observation is :
A90
B110
C85
D100
Answer: Option A
Explanation:Let the 6th observation be x.
According to the question,
Total = 11 * 60 -----(i)
Total of first five = 58 * 5 ---(ii)
Total of Last five = 56 * 5 ---(iii)
Now, 58 * 5 + 56 * 5 + x = 660.
=> 114 * 5 + x = 660.
=> x = 660 - 570 = 90.
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5 / 24
At 3.40, the hour hand and the minute hand of a clock form an angle of?
Answer: Option A
Explanation:In 60 min, min hand moves by 360 deg
and hr hand moves by 30 deg.
In 40 min, hr hand moves by 20 deg...wrt 3/0 clock position and 110 deg w.r.t 12'o clock position.
In 40 min, min hand moves by 240 deg.... w.r.t 12 'o clock position.
angle between min and hr hand = 240-110 = 130 deg
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6 / 24
A student is ranked 13th from right and 8th from left. How many are there?
A15
B20
C25
D10
Answer: Option B
Explanation:20 are there.
13th from right means = x + 12
8th from left means = 7 + x
Total = 12+7+1 = 20
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7 / 24
If A and B can do a piece of work in 10 days and A alone can do it in 15 days, how long will B take to do it?
A45 days
B30 days
C15 days
D40 dyas
Answer: Option B
Explanation:A+B=1/10
A=1/15
so,B=1/10-1/15=1/30
B take 30 days.
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8 / 24
Total ages of P, Q,R be 27. P is two years elder than Q. Who is twice as old as R. Then how old is Q?
A12
B10
C13
D14
Answer: Option B
Explanation:Let the age of R be x then ,
age of Q= 2x and of P=2x+2
now , according to question
(x)+(2x)+(2x+2)=25
i,e. x=5
Hence age of R = 5 years and of Q=2x=2*5=10 years.
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9 / 24
The average of the first five prime numbers greater than 20 is:
A32.20
B31.00
C31.01
D32.00
Answer: Option A
Explanation:prime no are 23,29,31,37,41 and average will be (23+29+31+37+41)/5=32.20
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10 / 24
What is the ratio of (1/4 )to the power 3 and (1/4) to the power 4?
A1:4
B3:4
C4:3
D4:1
Answer: Option D
Explanation:1/4 to the power 3 = 0.015625…...(1)
1/4 t0 the power 4 = 0.00390625…....(2)
Dividing (1) by (2), we get 4.
Hence ratio is 4:1
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