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BODMAS Table:

letters to signs:

Given: 9 A 3 C 15 B 2 = ? D 10

Substituting the signs into the equation and using the BODMAS rule we get:

⇒ 9 ÷ 3 + 15 × 2 = ? − 10

⇒ 3 + 15 × 2 = ? − 10

⇒ 3 + 30 = ? − 10

⇒ 33 = ? − 10

⇒ 43 = ?

Hence, the correct answer is "Option 2"

The least possible Venn diagram for the given statements is:

(I) Some scooters are motors  - Follows ( All motors are scooters. Some scooters are motors and Some  motors are scooters)

(II) All fans are scooters - Follows (All fans are motors and all motors are scooters. Hence all fans are scooters)

Both conclusions (I) and (II) follow.

Hence, the correct answer is "Option 1"

The logic follows here, 

Logic: Second letter = First letter − 2, Third letter = Second letter − 3.

For QOL,

IGD,

GFB,

 For KIF,

Therefore, the letter cluster that is different from the others is GFB.

Hence, the correct answer is "Option 3"

The logic follows here,

Given word: BACKLOG.

The letter that appears exactly twice is B.

Hence, the correct answer is " Option 4"

The logic follows here, 

The missing term in the series is BEG.

The correct answer is option 4

The logic followed here is:

• 184 − 20 = 164
• 164 − 19 = 145
• 145 − 18 = 127
• 127 − 17 = 110
• 110 − 16 = 94
• **94 − 15 = **79

Hence, the correct answer is 'Option 4';

The logic follows here,

Logic: The difference between consecutive numbers in the series represents the cubes of consecutive natural numbers starting from 1.

• 9 + 1³ = 9 + 1 = 10
• 10 + 2³ = 10 + 8 = 18
• 18 + 3³ = 18 + 27 = 45
• 45 + 4³ = 45 + 64 = 109
• 109 + 5³ = 109 + 125 = 234

the missing number in the series is 10.

Hence, the  correct answer is "option 2"

The logic follows here, 

In the first code set yy ae wp and the second code set mr yy sf, the common code is yy.

Hence, the correct answer is "option 2"

Given series: 5 3 8 6 6 3 5 7 9 7 3 4 8 3 9 2 5 5 1 5 6 1 2 

Required Conditions: Even-Even-Even

Left   5 3 8 6 6 3 5 7 9 7 3 4 8 3 9 2 5 5 1 5 6 1 2  Right

Thus, there is only one such digit in the series - 8 6 6 

Hence, the correct answer is 'Option 1'.

Given: Seven boxes, L, M, N, O, P, Q and R, are kept one over the other, but not necessarily in the same order.

1. P is kept second from the top.
2. N is kept immediately before P.
3. Only M is kept after O.
4. R is kept immediately above O.

1. Only three boxes are kept between L and M.
2. Q is the only box remaining and will occupy the only vacant position.

Final Arrangement:

Thus, two boxes are kept between Q and M.

Hence, the correct answer is 'Option 3'.