Study the given pattern carefully and select the number that can replace the question mark (?) in it.

First row - 15, 11, 43

Second row - 13, 8, 48

Third row - 9, 7, ?

(NOTE : Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations on 13 such as adding / subtracting / multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is NOT allowed)

This question was previously asked in
SSC CGL 2022 Tier-I Official Paper (Held On : 05 Dec 2022 Shift 4)
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  1. 23
  2. 30
  3. 27
  4. 28

Answer (Detailed Solution Below)

Option 1 : 23
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Detailed Solution

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The pattern followed in the given series is:

(First term - Second term) × 8 + Second term = Third term 

Now we apply the pattern on the given rows:

First row - 15, 11, 43

(15 - 11) × 8 + 11 = 43

4 × 8 + 11 = 43

32 + 11 = 43

43 = 43

Second row - 13, 8, 48

(13 - 8× 8 + 8 = 48

5 × 8 + 8 = 48

40 + 8 = 48

48 = 48

Third row - 9, 7, ?

(9 - 7× 8 + 7 = ?

2 × 8 + 7 = ?

16 + 7 = ?

23 = Answer

Hence, the correct answer is "Option 1".

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