Select the related word/letters/number from the given alternatives.
EFG : OPQ : : ? : STU
1). GHI
2). LMN
3). JKL
4). IJK
Elapidae Naja is the scientific name of _______.
1). Cobra
2). Elephant
3). Eagle
4). Owl
In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
m_o_mn_p_no_
1). mmnno
2). ooppn
3). mnooo
4). npomp
Coefficient of $x^2$ in (x + 3)(2 - 4x)(5x - 6) is
1). 26
2). -74
3). 74
4). -26
If a + b = 9 and $a^{2} + b^{2} = 61$, then value of ab is
1). 20
2). 10
3). 81
4). 142