Reasonin Rakesh Yadav

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Ex.7
– (20 – 5) = 85
In 2 nd row (24 ×6)
– (24 –6) = 126
In 3 rd row (28 × 7)
– (28 – 7) = 175
4 5 1
5 6 7
6 9 6
45 92 84
2
6
4
?
(a) 56 (b) 48
(c) 52 (d) 45
Sol. (b) Column pattern
In 1 st column 6² + 5²
– 4² = 45
In 2 nd column 9² + 6²
– 5² = 92
In 3 rd column 6² + 7² – 1²
= 84
In 4 th column 4² + 6² – 2²
48
Ex.8 4 6 10
2 1 3
5 8 ?
(a) 14 (b) 15
(c) 17 (d) 16
Sol. (c) In first row 4² – 6 = 10
Ex.9
In 2 nd row 2² – 1 = 3
In 3 rd row 5² – 8 = 17
5 8 14
9 6 21
7 2 ?
(a) 14 (b) 15
(c) 13 (d) 16
Sol. (b) In first row (5 × 2)
+
8
2
=14
In 2 nd row (9×2) +
In 3 rd row (7×2) +
Ex.10 5 9 15
16 29 ?
49 89 147
(a) 48 (b) 45
(c) 54 (d) 51
Sol. (a) In first column
6
2
= 21
2
2
= 15
(5 × 3) + 1 = 16, (16 × 3)
Ex.11
+ 1 = 49
In 2nd column
(9 × 3) + 2 = 29 , (29 × 3)
+ 2 = 89
In 3 rd column
(15 × 3) + 3 = 48, (48 × 3) +3
= 147
Find missing number
(yqIr la[;k Kkr djsa\)
8 13 10
7 12 9
10 15 ?
(a) 8 (b) 12
(c) 5 (d) 19
Sol. (b) In first row
+2 8 13 10
+3
In 2 nd row +2 7 12 9
+3
+2
10
In 3 rd row
15 12
+3
Ex.12 5 6 7 8
10 18 21 24
7 9 10 ?
(a) 11 (b) 15
(c) 13 (d) 20
Sol. (a) In 1 st column 10
5
+5
= 7
In 2 nd column 18
6
+6
= 9
Rakesh Yadav Sir
Ex.13
In 3rd column 21
7
+ 7 = 10
24
In 4th column =
8
+ 8
= 11
Find missing number.
(yqIr la[;k Kkr djsa\)
3 9 18
6 36 ?
2 4 12
(a) 12 (b) 6
(c) 612 (d) 81
Sol. (b) middle no. is multiplication
of diagonally opposite no.
eè; la[;k fod.khZ; rFkk foijhr la[;k
dk xq.kuiQy gSA
Ex.14
3 × 12 = 36
18 × 2 = 36
9 × 4 = 36
6 × 6 = 36
Find missing number?
(yqIr la[;k Kkr djsa\)
11 6 8
17 12 ?
25 34 19
19 28 11
(a) 16 (b) 15
(c) 13 (d) 9
Sol. (a) In 1 st column 11 + 25
Ex.15
= 17 + 19 = 36
In 2 nd column 6 + 34
= 12 + 28 = 40
In 3 rd column 8 + 19
= 16 + 11 = 27
Find missing number
yqIr la[;k Kkr djsa\
9 4 20
8 5 15
7 6 ?
(a) 4 (b) 6
(c) 3 (d) 2
Sol. (b) In 1 st row (9 – 4) × 4 = 20
Ex.16
In 2 nd row (8 – 5) × 5 = 15
In 3 rd (7 – 6) × 6 = 6
Find missing term?
yqIr la[;k Kkr djsa\
14 9 12
4 9 8
12 13 7
20
10
20
3 3 11 ?
20 42 19 40
(a) 2 (b) 8
(c) 12 (d) 4
Sol. (b) In first column (14 × 4)
– (12 × 3) = 20
In 2 nd column (9 × 9 )
– (13 × 3) = 42
In 3 rd column (12 × 8)
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