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Q.

21, 23, 29, 47, ____

see full answer

Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

a

65

b

90

c

75

d

110

answer is B.

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Detailed Solution

Variable difference series. Where, variables are product of digits.

$(i . e + 2, + 6, + 18, + 28)$

So, the answer is 47 + 28 = 75

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21, 23, 29, 47, ____