Series pattern
39 + 1 x 13 = 52
52 + 2 x 13 = 78
78 + 3 x 13 = 117
117 + 4 x 13 = 169

Correct Option: C

Series pattern
39 + 1 x 13 = 52
52 + 2 x 13 = 78
78 + 3 x 13 = 117
117 + 4 x 13 = 169
169 + 5 x 13 = 234 Should come in place of ?

Series Pattern
(-1)², (-2)², (-3)², (-4)²
Missing term = 36 - 3² = 27

Correct Option: B

Series Pattern
(-1)², (-2)², (-3)², (-4)²
Missing term = 36 - 3² = 27

According to question, we have,

1³ + 2³ + 3³ + ........ + n³ =		n × (n + 1)		²
		2

Correct Option: D

According to question, we have,

1³ + 2³ + 3³ + ........ + n³ =		n × (n + 1)		²
		2

∴		n(n + 1)		²	=		15 × 16		²
		2					2

The given sequence is :
First term = 1³ = 1
Second term = 2³ = 8
Third term = 3³ = 27
Fourth term = 4³ = 84 is wrong term . So , 64 is correct number .
Fifth term = 5³ = 125
........... and so on.

Correct Option: C

The given sequence is :
First term = 1³ = 1
Second term = 2³ = 8
Third term = 3³ = 27
Fourth term = 4³ = 84 is wrong term . So , 64 is correct number .
Fifth term = 5³ = 125
Sixth term = 6³ = 216
Seventh term = 7³ = 343
Clearly, 84 is the wrong number.

The given sequence is based on the following pattern :
52 – 1 = 51
51 – 3 = 48
48 – 5 = 43
43 – 7 = 34 is wrong number . So , 36 is correct number .
........... and so on.

Correct Option: B

The given sequence is based on the following pattern :
52 – 1 = 51
51 – 3 = 48
48 – 5 = 43
43 – 7 = 34 is wrong number . So , 36 is correct number .
36 – 9 = 27
27 – 11 = 16
Hence, 34 is the wrong number.