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Refer to the following number series and answer the question that follows. Counting to be done from left to right only. (All numbers are single-digit numbers only.)
(Left) 2 3 8 1 7 9 1 7 7 5 5 3 7 8 6 9 6 9 2 5 1 9 1 (Right)
How many such even digits are there, each of which is immediately preceded by an even digit and also immediately followed by an odd digit?

LW 3 is related to QV −10 in a certain way. In the same way, JU 6 is related to OT −7. To which of the following is PU 4 related, following the same logic?

M, N, O, P, W, X and Y are sitting around a circular table facing the centre of the table. Only two people sit between X and W when counted from the right of X. Only two people sit between W and M when counted from the right of W. Only three people sit between X and N when counted from the right of X. P sits to the immediate left of Y. Who sits third to the left of O?

Which letter cluster will replace the question mark (?) to complete the given series? ECO HFN KIM ? QOK

A, B, C, D, W, X and Y are sitting in a straight line facing north. No one sits to the left of D. Only four people sit between D and C. Only three people sit to the right of Y. X sits to the immediate left of A. W is not an immediate neighbour of Y. Who sits third to the left of W?

What should come in place of the question mark (?) in the given series?
15 17 21 23 27 ?

Each of the digits in the number 3241586 is arranged in the ascending order from left to right. The position(s) of how many digits will remain unchanged as compared to that in the original number?

In a certain code language, ‘A ? B’ means ‘A is the daughter of B’ ‘A = B’ means ‘A is the son of B’ ‘A @ B’ means ‘A is the father of B’ ‘A √ B’ means ‘A is the sister of B’ Based on the above, how is C related to L if 'C = D √ E ? F @ L'?

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete? GRK
45, KMG 54, OHC 63, SCY 72, ?

In the following triads, each group of letters is related to the subsequent one following a certain logic. Select from the given options, the one which follows the same logic.
JOBS - JSBO - SBOJ OILY - OYLI - YLIO