Challenger App

No.1 PSC Learning App

1M+ Downloads
What should come in place of the question mark (?) in the given series? 650 660 669 677 684 ?

A686

B688

C692

D690

Answer:

D. 690

Read Explanation:

Series: 650, 660, 669, 677, 684, ?

Step 1: Find the differences

Numbers

Difference

650 → 660

+10

660 → 669

+9

669 → 677

+8

677 → 684

+7

The pattern is decreasing by 1:
+10, +9, +8, +7, +6

Step 2: Add the next difference

684 + 6 = 690

Answer: 690


Related Questions:

5+6=31, 6+7=43, 7+8=57 ആയാൽ 8+9=_____
In a certain code language, 'can you swim' is coded as 'MQ TO LO' and 'He can drive' is coded as 'LO AB PQ'. How is 'can' coded in that code language?
In the following question there is a question mark in the blank space and it is only one of the five alternatives given under the question which satisfies the same relationship as is found between the two words to the left of the sign : : given in the question. Find the correct alternative in the question : ABDUCT: CDABUT :: ABODE: ?
9 സംഖ്യകളുടെ ശരാശരി 50 ആണ് . അതിൽ ആദ്യത്തെ നാല് സംഖ്യകളുടെ ശരാശരി 49ഉം അവസാനത്തെ നാല് സംഖ്യകളുടെ ശരാശരി 52 ഉം ആയാൽ അഞ്ചാമത്തെ സംഖ്യ എത്ര ?
The second number in the given number pairs is obtained by performing certain mathematical operation(s) on the first number. Select the pair in which the numbers are related in the same way as are the numbers of the given pairs. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 - Operations on 13 such as adding /deleting /multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.) 6 , 42 9 , 63