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766: The age of a father is twice that of the elder son. Ten years hence the age of the father will be three times that of the younger son. If the difference of ages of the two sons is 15 years, the age of the father is

(a) 100 years

(b) 70 years

(c) 60 years

(d) 50 years
767: If A, B, C, D are numbers in increasing order and D, B, E are numbers in decreasing order, then which one of the following sequences need neither be in a decreasing nor in an increasing order ?

(a) E, C, D

(b) E, B, C

(c) A, E, C

(d) D, B, A
768: The terms Wanna Cry, Petya and Eternal Blue' sometimes mentioned in the news recently are related to

(a) Exo-planets
(b) Crypto-currency
(c) Cyber attacks
(d) Mini satellites
769: Which of the following is/are treated as artificial currency ?

(a) ADR
(b) SDR
(c) GDR
(d) Both ADR and SDR
770: Who amongst the following was the first to state that the Earth was spherical?

(a) Aristotle

(b) Copernicus

(c) Ptolemy

(d) Strabo
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