Mathematics JAMB Past Questions

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956

Find the sum of the first 20 terms in an arithmetic progression whose first term is 7 and last term is 117.

A. 2480
B. 1240
C. 620
D. 124

View Answer & Discuss JAMB 1991

957

The area of a square is 144 sq cm. Find the length of its diagonal

A. 11\(\sqrt{3cm}\)
B. 12cm
C. 12\(\sqrt{2cm}\)
D. 13cm

View Answer & Discuss (4) JAMB 1991

958

One angle of a rhombus is 60^o. The shorter of the two diagonals is 8cm long. Find the length of the longer one.

A. 8\(\sqrt{3}\)
B. \(\frac{16}{\sqrt{3}}\)
C. \(\sqrt{3}\)
D. \(\frac{10}{\sqrt{3}}\)

View Answer & Discuss JAMB 1991

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959

If the exterior angles of a pentagon are x°, (x + 5)°, (x + 10)°, (x + 15)° and (x + 20)°, find x

A. 118^o
B. 72^o
C. 62^o
D. 36^o

View Answer & Discuss (6) JAMB 1991

960

A flagstaff stands on the top of a vertical tower. A man standing 60 m away from the tower observes that the angles of elevation of the top and bottom of the flagstaff are 64^o and 62^o respectively. Find the length of the flagstaff.

A. 60 (tan 62^o - tan 64^o)
B. 60 (cot 64^o - cot 62^o)
C. 60 (cot 62^o - cot 64^o)
D. 60 (tan 64^o - tan 62^o)

View Answer & Discuss (1) JAMB 1991

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