91. The sum of how many terms of the series 6 + 12 + 18 + 24 + …….. is 1800?
(A) 16
(B) 20
(C) 12
(D) 24
Answer:
Explanation:
92. 2 + 2² + 2³ + ……. + 2⁹ = ?
(A) 1056
(B) 2044
(C) 1022
(D) 2244
Answer:
Explanation:
93. A sum of Rs. 312 was divided among 100 boys and girls in such a way that each boy gets Rs. 3.60 and each girl Rs. 2.40. The numbers of girls are:
(A) 20
(B) 60
(C) 40
(D) 90
Answer:
Explanation:
94. The square root of (272² – 128²) is:
(A) 240
(B) 200
(C) 100
(D) 300
Answer:
Explanation:
95. A square matrix is said to be an upper (lower) triangular matrix if all entries below (above) the main diagonal are ______
(A) One
(B) Zero
(C) Two
(D) None of these
Answer:
Explanation: