Question 50

Select the option that will replace the question mark (?) in the given series.

78, 89, 82, 87, 84, ?

Solution

Prime numbers are added and subtracted from each term on the alternative basis which is given below.

78+11 = 89

89-7 = 82

82+5 = 87

87-3 = 84

84+2 = 86

Hence '86' will come in place of the question mark.

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