Solution:
The first letters in odd numbered terms from series. J - 1 = I - 1 = H and in even numbered terms from series K + 1 = L + 1 = MMiddle Number : 2 + 2 = 4 + 3 = 7 + 4 = 11 + 5 = 16 + 6 = 223rd letter : Z - 2 = X - 2 = V - 2 = T - 2 = R - 2 = P

Solution:
The given sequence is a combination of two series: I. Z, W, T, Q, ? and II. S, O, k, G, ?

Solution:
a + 3 = d - 1 = c + 3 = f - 1 = e + 3 = h - 1 = g + 3 = j - 1 = i

Solution:
The pattern is x 2 + 1, x 2 - 1, x 2 + 1, x 2 - 1,..... So, missing term = 101 x 2 + 1 = 203.

Solution:
The given sequence is a combination of two series : I. 1st, 3rd, 5th, 7th, 9th, 11th terms i.e. A, B, C, D, E, ? II. 2nd, 4th, 6th, 8th, 10th terms i.e. B, D, F, H, ? Clearly, I consists of consecutive letters while II consists of alternate letters. So, the missing letter in I is F, while that in II is J. So, the missing terms i.e. 10th and 11th terms are J and F respectively.

Solution:
The pattern is + 90 + 100, + 110,..... So, missing term = 310 + 120 = 430.

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