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Direction: What will come in the place of question mark (?) in the following number.

  1. 3120, ?, 122, 23, 4
    1. 488
    2. 621
    3. 610
    4. 732
    5. None of these
Correct Option: B

As per above given series , we can see that
Descending order of given series -
Next term = ( 5 x previous term ) + odd number ( which starts 3 )
Here , 5th term = 4
4th term = 5 × 5th term + 3
4th term = 5 × 4 + 3 = 23
3rd term= 5 × 4th term + 7
3rd term= 5 × 23 + 7 = 122
Similarly , we can find all others terms also.
2nd term = 5 × 3rd term + 11
2nd term = 5 × 122 + 11 = ?
? = 621
1st term = 5 × 2nd term + 15
1st term = 5 × 621 + 15 =3120



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