Challenger App

No.1 PSC Learning App

★
★
★
★
★
1M+ Downloads
What should come in place of the question mark (?) in the given series? 620 621 624 629 636 ?

A643

B645

C646

D644

Answer:

B. 645

Read Explanation:

Series:
620, 621, 624, 629, 636, ?

Find the differences

621 − 620 = 1
624 − 621 = 3
629 − 624 = 5
636 − 629 = 7

The pattern is consecutive odd numbers:

1, 3, 5, 7

Next odd number = 9

Add 9

636 + 9 = 645

Final Answer: 645


Related Questions:

In a certain code language, 'FRAME' is written as 'HPCKG', and 'PEACH' is written as 'RCCAJ'. How will 'BROOM' be written in that language?
The position(s) of how many letters will remain unchanged if each of the letters in the word SYMPHONY is arranged in the English alphabetical order?
LNPR is related to TVXZ in a certain way based on the English alphabetical order. In the same way, FHJL is related to NPRT. To which of the given options is ZBDF related, following the same logic?
If '+' means '-', '-' means '+', 'x' means '÷', then 50 + 10 - 5 × 5 = ?
In each of the following questions, a specific rearrangement of letters has been applied to the first word to form the second. Apply the same rearrangement pattern to the third word and choose the correct answer from the given options. METAPHOR: EMATHPRO :: NORMAL: ?