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What should come in place of the question mark (?) in the given series?

351 335 319 303 287 ?

Refer to the following number series and answer the question that follows (all numbers are single-digit numbers only). Counting to be done from left to right only.

(Left) 4 8 2 8 2 3 8 3 1 3 9 1 7 3 9 7 6 2 6 6 6 8 2 (Right)

How many such even numbers are there, each of which is immediately preceded by an even number and also immediately followed by an odd number?

M, N, O, P, W, X and Y are sitting around a circular table facing the centre of the table. W sits third to the left of O. X sits second to the left of Y. O is the immediate neighbour of both N and X. P is not an immediate neighbour of W. How many people sit between M and X when counted from the right of M?

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statement(s).

Statements:
All books are pens.
Some pens are erasers.

Conclusions:
(I) All erasers are pens.
(II) Some books are erasers.

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’ and
A √ B means ‘A is the sister of B’.

How is C related to L if 'C = D @ E √ F ? L'?

Mr. Akai starts from Point A and drives 9 km towards south. He then takes a left turn, drives 7 km, turns left and drives 21 km. He then takes a left turn and drives 18 km. He takes a final left turn, drives 12 km and stops at Point P. How far (shortest distance) and towards which direction should he drive in order to reach Point A again? (All turns are 90 degrees turns only unless specified)

In a certain code language, ‘store what matters’ is coded as ‘bf yt xc’ and ‘don't store it’ is coded as ‘hd ip xc’. How is ‘store’ coded in the given language?

(All codes are two-letter codes)

What should come in place of the question mark (?) in the given series?

321 323 327 333 341 ?

Which letter-number cluster will replace the question mark (?) in the given series to make it logically complete?

DRA120, OCL102, ZNW84, KYH66, ?

What will come in place of the question mark (?) in the following equation if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged?

22 − 13 ÷ 21 × 39 + 48 = ?